Definitions of tactical and positional play

Tactics is what you do when there is something to do.
Strategy is what you do when there is nothing to do.
Tactics is what you do when there is something to do.
Strategy is what you do when there is nothing to do.
During many chess discussions and analyses, the concepts of 'tactical' and 'positional' play are frequently mentioned. However, it is rare when one tries to explain the meaning of these two words, and when they do, their definitions are often unclear and contradictory to each other. I would like to ask the experienced players, how can the 'tactical' and 'positional' elements of chess be comprehensively and accurately defined?