Question

do gases have a definite volume at definite temperature and pressure

Answer 1

No they don’t have a definite VOLUME

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Answer 2

Gases do not have a definite volume in general.

22.4 litres is the molar volume of a gas, it refers to the volume occupied by 1 mole of a gas at Standard Temperature and Pressure.
So it is better to imagine 22.4 litres of gas occupying a container at STP