cardinal number

noun

Definition of cardinal number

  1. 1 :  a number (such as 1, 5, 15) that is used in simple counting and that indicates how many elements there are in an assemblage — see number table

  2. 2 :  the property that a mathematical set has in common with all sets that can be put in one-to-one correspondence with it

1591

First Known Use of cardinal number

1591


CARDINAL NUMBER Defined for English Language Learners

cardinal number

noun

Definition of cardinal number for English Language Learners

  • : a number (such as 1, 2, or 3) that is used in simple counting and shows quantity


CARDINAL NUMBER Defined for Kids

cardinal number

noun

Definition of cardinal number for Students

  1. :  a number (as 1, 5, 22) that is used in simple counting and answers the question “how many?”



Seen and Heard

What made you want to look up cardinal number? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to link together in a series or chain

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • winning-words-from-the-national-spelling-bee-logo
  • Which is the correct spelling of the winning word from 1988?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Syn City

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!