Etymology 1 
From Middle English might, myghte, (also maught, macht, maht), from Old English miht, mieht, meaht, mæht (“might, bodily strength, power, authority, ability, virtue, mighty work, miracle, angel”), from Proto-Germanic *mahtiz, *mahtuz (“might, power”), from Proto-Indo-European *mógʰtis, *magʰ- (“to allow, be able, help”), corresponding to Germanic *maganą + *-þiz. Cognate with Scots micht, maucht (“might”), North Frisian macht (“might, ability”), West Frisian macht (“might, ability”), Dutch macht (“might, power”), German Macht (“power, might”), Swedish makt (“might”), Icelandic máttur (“might”).
- (uncountable) Power, strength, force or influence held by a person or group.
- (uncountable) Physical strength.
- He pushed with all his might, but still it would not move.
- (uncountable) The ability to do something.
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Etymology 2 
- (auxiliary) Used to indicate conditional or possible actions.
- I might go to the party, but I haven't decided yet.
- (auxiliary) Simple past of may. Used to indicate permission in past tense.
- He asked me if he might go to the party, but I haven't decided yet.
- (auxiliary) Simple past of may. Used to indicate possibility in past tense.
- I thought that I might go the next day.
- archaic second-person singular simple past - mightest
- nonstandard, archaic third-person singular simple past - mighteth