academic

related to a school; not practical or directly useful

acclimate

adjust to climate or environment; adapt

accost

approach and speak first to a person

acetic

vinegary

acrophobia

fear of heights

actuarial

calculating; pertaining to insurance statistics

actuary

someone who advises insurance companies

actuate

motivate; activate; cause to act

addendum

addition; appendix to book; something that is added (as at the end of a speech or book)

ambrosia

food of the gods

nectar

drink of the gods; sweet liquid collected by bees