AD | Definition of AD

noun (1), often attributive

\ ˈad

Definition of ad

(Entry 1 of 7)

1 : advertisement sense 1 newspapers ads TV ads for new cars

2 : advertising an ad agency

noun (2)

Definition of ad (Entry 2 of 7)

: advantage sense 4

abbreviation (1)

Definition of AD (Entry 3 of 7)

1 active duty

2 after date

3 airworthiness directive

4 Alzheimer's disease

5 anno Domini —often printed in small capitals and often punctuated

6 assembly district

7 assistant director

8 athletic director

9 right ear — used especially in audiology and in writing medical prescriptions

A/D

abbreviation (2)

Definition of A/D (Entry 4 of 7)

analog/digital

ad-

prefix

variants: or ac- or af- or ag- or al- or ap- or as- or at-

Definition of ad- (Entry 5 of 7)

1 : to : toward —usually ac- before c, k, or q acculturation and af- before f affluent and ag- before g aggradation and al- before l alliteration and ap- before p apportion and as- before s assuasive and at- before t attune and ad- before other sounds but sometimes ad- even before one of the listed consonants adsorb

2 : near : adjacent to —in this sense always in the form ad- adrenal

-ad

adverb suffix

Definition of -ad (Entry 6 of 7)

: in the direction of : toward cephalad

-ad

noun suffix

Definition of -ad (Entry 7 of 7)

: member of a botanical group bromeliad

History and Etymology for ad

Noun (1)

by shortening

Noun (2)

by shortening

Prefix

borrowed from Latin, prefix forming verbs and verbal derivatives, marking movement toward, tendency, addition, from ad, preposition, "to, as far as, at, near, in accordance with" — more at at entry 1

Adverb suffix

borrowed from Latin ad "to, toward" — more at at entry 1

Noun suffix

borrowed from New Latin -ad-, -as, borrowed from Greek -ad-, -as, feminine noun suffix denoting descent from or connection with

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More Definitions for ad

noun

\ ˈad

Kids Definition of ad

: advertisement

A.D.

abbreviation

Kids Definition of A.D.

in the year of our Lord

Hint: A.D. is an abbreviation for the Latin phrase anno Domini, which means “in the year of our Lord.”

abbreviation

Medical Definition of AD

1 Alzheimer disease; Alzheimer's disease

2 atopic dermatitis

3 [ Latin auris dextra ] right ear —used especially in audiology and in writing medical prescriptions

4 average deviation