noun /mĩ́/ high-tone /mĩ̄/ mid-tone /mĩ̀/ low-tone
M (alternative), m (alternative)
Definitions
  1. The syllable used to represent the high-tone and its diacritic (´)
Other entries with this spelling
Wiktionary records 4 entries spelled “mí”. You're reading one of them; here are the others.
Etymology
From mi used in solfège to represent the third note of a major scale.
Possibly used in
Source: Wiktionary · etymology 8, where this word is spelled “mi”. Reference: en-mi-yo-noun-aFkz2w0-