leading tone

[lee-ding] /ˈli dɪŋ/
noun, Music.
1.
the seventh degree of a diatonic scale; subtonic.
Also called leading note.
Origin
1910-15
British Dictionary definitions for leading note

leading note

/ˈliːdɪŋ/
noun (music)
1.
another word for subtonic
2.
(esp in cadences) a note, usually the subtonic of a scale, that tends most naturally to resolve to the note lying one semitone above it