often attributive
1
: advertisement sense 1
newspapers ads
TV ads for new cars
2
: advertising
an ad agency
1
active duty
2
after date
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
analog/digital
variants
or ac-
or af-
or ag-
or al-
or ap-
or as-
or at-
1
: to : toward
—usually ac- before c, k, or q
acculturation
and af- before faffluent
and ag- before gaggradation
and al- before lalliteration
and ap- before papportion
and as- before sassuasive
and at- before tattune
and ad- before other sounds but sometimes ad- even before one of the listed consonantsadsorb
2
: near : adjacent to
—in this sense always in the form ad-
adrenal
-ad
6 of 7adverb suffix
: in the direction of : toward
cephalad
: member of a botanical group
bromeliad
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Merriam-Webster unabridged
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