Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary
1

id

play
noun \ˈid\

Simple Definition of id

  • psychology : a part of a person's unconscious mind that relates to basic needs and desires

Source: Merriam-Webster's Learner's Dictionary

Full Definition of id

  1. :  the one of the three divisions of the psyche in psychoanalytic theory that is completely unconscious and is the source of psychic energy derived from instinctual needs and drives — compare ego, superego

Origin of id

New Latin, from Latin, it


First Known Use: 1924

Rhymes with id


2

id

abbreviation

Definition of id

  1. idem




1

ID

play
noun \ˈī-ˈdē\

Simple Definition of ID

  • : to find out the identity of (someone or something)

Source: Merriam-Webster's Learner's Dictionary

Full Definition of ID

plural ID's or IDs

  1. :  a document (as a card) bearing identifying information about and often a photograph of the individual whose name appears on it —called also ID card, identification card, identity card

Examples of id in a sentence

  1. The police have not yet ID'd the victim.

  2. <studies that show that eyewitnesses are surprisingly unreliable when called upon to ID the perpetrators of crimes>



1941

First Known Use of id

1941


2

ID

play
verb \ˈī-ˈdē\

Definition of ID

ID'd or IDedID'ing or IDing

  1. transitive verb
  2. :  identify <ID'd the thief>




3

ID

abbreviation

Definition of ID

  1. 1 Idaho

  2. 2 identification

  3. 3 independent distributor

  4. 4 industrial design

  5. 5 often not capitalized inside diameter; inner diameter; internal diameter

  6. 6 often not capitalized inside dimensions

  7. 7 intelligence department




1

-id

noun suffix

Definition of -id

  1. 1 :  one belonging to a (specified) dynastic line <Abbasid>

  2. 2 :  meteor associated with or radiating from a (specified) constellation or comet <Perseid>



Origin of -id

in sense 1, from Latin -ides, masculine patronymic suffix, from Greek -idēs; in sense 2, from Italian -ide, from Latin -id-, -is, feminine patronymic suffix, from Greek


2

-id

noun suffix

Definition of -id

  1. :  body :  particle <chromatid>



Origin of -id

probably from Latin -id-, -is, feminine patronymic suffix, from Greek



ID Defined for Kids

ID

play
abbreviation

Definition of ID for Students

  1. 1 Idaho

  2. 2 identification





Seen and Heard

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

WORD OF THE DAY

a smart aleck

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

oily prompt angry maudlin
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ