Ordinal Meaning: Definition, Examples and Ordinal vs Cardinal

“Ordinal” describes position in an ordered sequence: first, second, third, fourth are ordinal numbers (or ordinals), because they tell you where something comes in a series rather than how many things there are. The word comes from Latin ordo, “row, series, rank” — the same root as order — and it is most often met in the phrase ordinal number. This article defines the term properly, sets ordinals against cardinal and nominal numbers, gives the pronunciation for British and American English, shows where ordinals are used (dates, floors, centuries, rankings), and briefly covers the -st / -nd / -rd / -th suffixes. The suffix system has one famous trap — 11, 12 and 13 — kept brief here so this page stays what it should be: the definition article.

What does “ordinal” mean? The dictionary definition

The major dictionaries describe the same idea in almost identical words:

• Oxford Learner’s Dictionaries: an ordinal (also ordinal number) is “a number that refers to the position of something in a series, for example ‘first’, ‘second’, etc.” — with a cross-reference: “compare cardinal.”
• Merriam-Webster: an ordinal number is “a number designating the place (such as first, second, or third) occupied by an item in an ordered sequence.”
• Collins (COBUILD): “An ordinal number or an ordinal is a word such as ‘first,’ ‘third,’ and ‘tenth’ that tells you where a particular thing occurs in a sequence of things.”
• Cambridge Dictionary: ordinal numbers are numbers such as 1st, 2nd, 3rd that show the order of things in a list.

Three elements are common to every definition. First, there must be a series — a queue, a ranking, a set of floors, a run of dates. Second, the ordinal picks out one item’s place within that series. Third, it says nothing about size: knowing that a runner finished seventh tells you her position, not how many runners there were.

Grammatically, Cambridge’s grammar guidance notes that English uses ordinal numbers “to put things in an order” and that they are “most commonly used as determiners” — placed before a noun, as in the second attempt, my first car, her third child. Ordinal also works as an adjective in phrases such as an ordinal scale (values that have an order but no fixed gaps, as in survey answers from “poor” to “excellent”), though the everyday meaning is the number one. Oxford traces the word to late Latin ordinalis, “relating to order in a series,” from Latin ordo, ordin-, “row, series, rank.” Remember order, and you remember ordinal.

The ordinal numbers at a glance

Position	Ordinal word	Short form	Position	Ordinal word	Short form
1	first	1st	11	eleventh	11th
2	second	2nd	12	twelfth	12th
3	third	3rd	13	thirteenth	13th
4	fourth	4th	14	fourteenth	14th
5	fifth	5th	15	fifteenth	15th
6	sixth	6th	20	twentieth	20th
7	seventh	7th	21	twenty-first	21st
8	eighth	8th	22	twenty-second	22nd
9	ninth	9th	30	thirtieth	30th
10	tenth	10th	100	one hundredth	100th

Three spelling facts in that table catch writers out. First, second and third are inherited whole words, not “one + th.” Then three cardinals change their spelling before taking -th: five → fifth (not “fiveth”), nine → ninth (not “nineth”), and twelve → twelfth. Compound ordinals change only the final element: twenty-one → twenty-first.

Ordinal vs cardinal vs nominal: three jobs for numbers

Type	Job	Question it answers	Examples
Cardinal	Count quantity	“How many?”	one, two, three… — “three chairs,” “two hundred people”
Ordinal	Mark position in a sequence	“Which one in the order?”	first, second, third… — “the third chair from the door,” “her second attempt”
Nominal	Name or identify	“Which label?” (no counting, no ranking)	A player’s jersey number 4; the code 02116; a bus number 24

Cambridge defines cardinals in exactly the complementary way: “a number such as 1, 2, 3, etc that shows the quantity of something.” Collins’ grammar makes the same pairing: cardinal numbers “are used in all forms of counting that involve a total,” while ordinals “talk about where something is placed in an ordered sequence.” The standard summary is that a cardinal tells “how many,” an ordinal tells “the order of things in a set,” and a nominal number “names something… used only to identify something.”

The nominal row explains behaviour that otherwise looks bizarre. The “24” on a bus or jersey is not counting twenty-four of anything, and the bus numbered 24 is not necessarily the twenty-fourth bus; the digits are a label, and could equally well be a letter. This is why nominal numbers keep “meaningless” zeroes — the code 02116 read as a quantity would just be 2,116. As a label, the zero is essential. A single string of digits can move between jobs: “Room 204” is nominal (a label), “the 204th room they had cleaned that week” is ordinal, and “204 rooms” is cardinal.

Ordinals normally travel with the or a possessive — the first time, my second coffee — because a position only makes sense against a known series. Cardinals need no such support: three coffees is complete on its own. And when the two combine, the ordinal comes first: the first three chapters, not “the three first chapters.”

Pronunciation

Ordinal itself. British English: /ˈɔː.dɪ.nəl/ — “OR-din-uhl,” three syllables, stress on the first. American English: /ˈɔːr.dən.əl/ — the r is pronounced, and the middle vowel reduces towards a schwa. Oxford’s transcriptions differ only in notation, not sound.

The everyday ordinals. First is UK /fɜːst/, US /fɜːrst/ — one syllable, and the source of the -st ending in 1st, 21st, 31st. The feature learners most need to hear is the final consonant stack in fourth, fifth, sixth, twelfth: slow, careful speech — “six-th,” tongue between the teeth for the final sound — beats swallowing the ending. Second stresses its first syllable (“SEK-und”), and compound ordinals stress the final element: twenty-first, forty-second. If you can say the full ordinal word correctly, you already know its written suffix.

The suffixes in brief: -st, -nd, -rd, -th

Written short forms copy the ending of the spoken ordinal word. First ends in -st, so 1 is 1st; second ends in -nd, so 2 is 2nd; third ends in -rd, so 3 is 3rd; and the great majority — fourth, fifth, tenth, twentieth — end in -th, giving 4th, 5th, 10th, 20th. Collins’ grammar summary is that “ordinals are mostly formed by adding -th to a cardinal number,” with first, second and third as the standing exceptions, “and combinations which contain them, such as twenty-first.” So the choice for any compound number is decided by its last word: twenty-third → 23rd, twenty-fourth → 24th.

The single exception is built into the words themselves. Eleventh, twelfth and thirteenth end in the “th” sound, so they take -th despite ending in the digits 1, 2 and 3: 11th, 12th, 13th — and likewise any larger number ending in those teens, such as 111th or 213th. But 21, 22 and 23 are not exceptions, because twenty-first, twenty-second and twenty-third end in -st, -nd and -rd. That is the whole rule, stated briefly by design.

Where ordinals are used

• Dates. Days of the month are ordinals. British writing often prints the bare figure (“5 November”), yet it is still read aloud as “the fifth of November”; American style commonly writes the suffix (“November 5th”) and reads it “November fifth.” Spelled out, the ordinal is compulsory: the twenty-third of June.
• Floors and storeys. “On the third floor,” “a seventh-floor flat.” Note the British–American trap: the British ground floor is the American first floor, so the same room can honestly carry two different ordinals.
• Centuries. Centuries are counted ordinally: the 1800s are the nineteenth century (the ordinal runs one ahead of the opening digits, because the years 1–100 formed the first century). We are living in the twenty-first century.
• Rankings and results. Finishing positions, editions and anniversaries take ordinals: “she finished ninth,” “their fiftieth wedding anniversary,” “the twenty-third edition.”
• Sequence and rank. First… second… finally organises steps and arguments; Oxford also records the regnal use — “King Edward I” is pronounced “King Edward the First.”

Common mistakes

Using a cardinal where the meaning is positional. “He finished three in the race” mixes the systems: finishing is a position, so English wants “he finished third.” Conversely, “the third chairs need replacing” wrongly makes a quantity positional; say “the three chairs,” or, if position is meant, “the third chair.”

Writing “nineth” or “fiveth.” The spelling changes come first: nine → ninth (the e drops), five → fifth. Checking the fully written word, rather than mechanically adding -th to the cardinal, prevents both errors — and likewise “23th,” since twenty-third ends in -rd.

Dropping “the” before an ordinal. Because an ordinal presumes a known series, it normally needs the or a possessive: “she was first woman to…” should be “she was the first woman to…”

Reading nominal digits as ordinals. “Platform nine” is a label, not a counted position; and the digits of a phone or account number should be read as separate labels (“oh-two-one-one-six”), never converted into an ordinal or a quantity.

FAQs

What is an ordinal number in simple words?

A number that shows position in a series: first, second, third, fourth… If a number tells you where something stands in an order rather than how many things there are, it is ordinal.

What is the difference between ordinal and cardinal numbers?

Cardinals count: one, two, three answer “how many?” Ordinals rank: first, second, third answer “which one in the sequence?” Twins illustrate it neatly — “two babies” is cardinal; “the second baby” is ordinal.

How do you pronounce “ordinal”?

UK /ˈɔː.dɪ.nəl/ (“OR-din-uhl”), US /ˈɔːr.dən.əl/. Three syllables; the stress falls on the first syllable in both varieties.

Is “first” a cardinal or an ordinal?

Ordinal — the partner of the cardinal one, just as second partners two and third partners three.

Why do 11, 12 and 13 take “-th”?

Because their spoken forms — eleventh, twelfth, thirteenth — end in the “th” sound. Written suffixes copy the end of the spoken word, so the teens take -th even though 1, 2 and 3 alone take -st, -nd, -rd.

Takeaway

Ordinal means “to do with position in an order.” An ordinal number — first, second, third, or 1st, 2nd, 3rd — tells you where something stands in a series and nothing about quantity; cardinals count how many, and nominal numbers merely label. Say the ordinal word in full and its spelling and suffix follow, teens excepted.