What does 'unit' mean in this sentence?

[learning_english]

You can use 'bout' for a fight in boxing; it's the unit like match/game etc for fighting.

What does `unit' mean in this sentence?

Please explain it.
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Please let me know if I have made any mistakes in any of my sentences.

[Mister Micawber]

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(I presume that this is your post, Gary.)

Unit = 'An entity regarded as an elementary structural or functional constituent of a whole'.

One bout = one boxing competition between 2 boxers
One match = one tennis competition between 2 tennis players
One game = one baseball competition between 2 teams
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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber