There are 2 main definitions of mi in English:

mi1

Syllabification: mi

noun

Music
1(In solmization) the third note of a major scale.
1.1The note E in the fixed-do system.

Origin

late Middle English mi, representing (as an arbitrary name for the note) the first syllable of mira, taken from a Latin hymn (see solmization).

Definition of mi in:

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There are 2 main definitions of mi in English:

MI2

Syllabification: MI

abbreviation

1.1British historical Military Intelligence: MI5

Definition of mi in: