Propensity:

The tidal wave of the heart.

Age II:

A numeral representing the time you have consumed from an alloted total you do not know.

Adulterate:

Spoil everything for a kid by telling him to "grow up".

Abbreviation:

The word justifies the meaning.

Advice:

The only thing everybody likes to give away freely.

Priority:

Tasks in order of importance for the subject.
Priority of a predator is to catch dinner.
The priority of dinner is to reach breakfast.