acumen

addled bunch

adoration

adorn

adroit

adulate

adulterate  (2) milk

advanced warning (in years, case)

the night is far advanced 

to advance growth 

adventurism

adversary (worthy ...)

adverse (effects)

adversely 

companions in adversity 

advisability

it may be advisable to wait

I advised him against going 

please advise me of receipt 

advisedly

advisory

in an advisory capacity

advocacy 

aegis (under the ... of)

aeons

aeration