also mid-life, 1837, from mid (adj.) + life. Middle-life is from early 14c. Midlife crisis "transition of identity and self-confidence that can occur in middle-aged individuals" is attested by 1965 (crisis of mid-life is by 1963).
midge
midget
MIDI
Midi
midland
midlife
midmost
midnight
midpoint
Midrash
midriff
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