1

ad

play
noun, often attributive \ˈad\

Definition of ad

  1. 1 :  advertisement 1 <newspapers ads> <TV ads for new cars>

  2. 2 :  advertising <an ad agency>

1799

First Known Use of ad

1799


2

ad

noun

Definition of ad

  1. :  advantage 4

1915

First Known Use of ad

1915


AD

abbreviation

Definition of AD

  1. 1 active duty

  2. 2 after date

  3. 3 Alzheimer's disease

  4. 4 anno Domini —often printed in small capitals and often punctuated

  5. 5 assembly district

  6. 6 assistant director

  7. 7 athletic director


ad-

prefix
variants: or

ac-

or

af-

or

ag-

or

al-

or

ap-

or

as-

or

at-

Definition of ad-

  1. 1 :  to :  toward —usually ac- before c, k, or <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. 2 :  near :  adjacent to —in this sense always in the form ad- <adrenal>

Origin and Etymology of ad-

Middle English, from Anglo-French & Latin; Anglo-French, from Latin, from ad — more at at


1

-ad

adverb suffix

Definition of -ad

  1. :  in the direction of :  toward <cephalad>

Origin and Etymology of -ad

Latin ad


2

-ad

noun suffix

Definition of -ad

  1. :  member of a botanical group <bromeliad>

Origin and Etymology of -ad

probably from New Latin -ad-, -as, from Greek, suffix denoting descent from or connection with



AD Defined for Kids

ad

play
noun \ˈad\

Definition of ad for Students


Medical Dictionary

AD

abbreviation

Medical Definition of AD

  1. 1Alzheimer disease; Alzheimer's disease

  2. 2atopic dermatitis

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

  4. 4average deviation



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