pennant race definition

Question
Have an ongoing argument going on and would like to resolve
it,
Could you give me the definition of what the pennant race
consists of??
It was my understanding that the all post season games were
a part of the pennant race.

Answer
While the most common definition of pennant race involves only post-season games, it could also be argued that all regular season games are included in the pennant race as well. Since the pennant race is a race for the championship banners, the race to the post-season could be a part of it.

However, the most common idea of a pennant race is one where teams in the post-season race for the AL and NL pennants.

A pennant is any banner signifying a championship of any given league.