1

is

Definition of is

  1. present tense third-person singular of be

  1. dialectal present tense first-person and third-person singular of be

  1. dialectal present tense plural of be

Origin and Etymology of is

Middle English, from Old English; akin to Old High German ist is (from sīn to be), Latin est (from esse to be), Greek esti (from einai to be)


2

is

abbreviation

Definition of is

  1. island; isle


IS

abbreviation

Definition of IS

  1. information system


is-

combining form
variants: or

iso-

Definition of is-

  1. 1 :  equal :  homogeneous :  uniform isentropic

  2. 2 :  isomeric isocyanate

  3. 3 :  for or from different individuals of the same species isoagglutinin

Origin and Etymology of is-

Late Latin, from Greek, from isos equal


IS Defined for Kids

is

Definition of is for Students

  1. present third person sing of be


Learn More about is


Seen and Heard

What made you want to look up is? 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 counsel, recommend, or inform

Get Word of the Day daily email!

Test Your Vocabulary

The Emoji Quiz

  • emoji-the-quiz
  • What phase of the moon is this: 🌖 ?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

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!