Definition of re in US English:

re

(North American ray)

noun

Music
  • 1(in solmization) the second note of a major scale.

    1. 1.1 The note D in the fixed-do system.

Origin

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

Pronunciation

re

/reɪ//rā/