What is the meaning of Ready?

The command to make ready, regardless of language of competitors, used in multiple sports to get contestants to their marks in preparation to start.

Prepared for immediate action or use.

first only use predicatively, freely used from the end of the 17th century

Inclined; apt to happen.

Liable at any moment.

Not slow or hesitating; quick in action or perception of any kind.

Offering itself at once; at hand; opportune; convenient.

To prepare; to make ready for action.

Ready money; cash.

Source: wiktionary.org