Priority Can Be

Preference

Antecedence

Preeminence

The one thing

A function of context

That which matters most

Precedence in place or rank

An item's relative importance

An established right to precedence

A goal of a person or an organisation

Keeping the main thing the main thing

First things first, second things never

Something that is considered more important than other things

Precedence, especially established by order of importance or urgency