Adverb
Used other than figuratively or idiomatically: see very, well.
Used to weaken the effect of certain modal verbs.
Interjection
Indicating acceptance, often with resignation or acquiescence, of a statement or situation.
Synonym of fair enough. (Can we add an example for this sense?)
A standard response by a superior to a report or confirmation.
Adjective
Used other than figuratively or idiomatically: see very, well.