Of the two, inter is used more frequently, and is sometimes mistakenly used in place of intra.
Inter refers to actions between members of different groups.
The Milwaukee Brewers played the New York Yankees in an inter-league game.
If you are referring to elements of the same group or area, use intra.
The two teams from Marketing faced off in some friendly intra-office rivalry.
Calls from Brookfield to Oconomowoc and West Bend are considered intra-LATA.
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