全音 is read as ぜんおん (zenon) and means whole tone.
ぜんおん
zenon
さんぜんおん
tritone
ぜんおんかい
diatonic scale
ぜんおんおんかい
whole-tone scale
ちゅうぜんおんりつ
meantone temperament
ぜんいん
all members
ぜんこく
the whole country
ぜんたい
to begin with
ぜんりょく
all one's power (strength, energy, efforts)
ぜんぶ
all
ぜんしゅう
complete works
ぜんぜん
(not) at all
ぜんち
complete recovery