abbreviations
"Tr" - a traditional, usually academic definition or symbol
"Ex-" - example

ABCDEFGHIJKLMNOPQRSTUVWXYZ

A
the Alto voice in a choir.

ALTERNATION
(of Beats and Off-beats) Qualitative Dimension in the World of Time

AMPHIBRACH
A 3-syllable word consisting of Off-beat/Beat/Off-beat (Ex- "tomorrow"). see Scansion

ANACRUSIS
see Pick-up

ANAPEST
A 3-syllable word consisting of Off-beat/Off-beat/Beat (Ex- "afternoon"). see Scansion

ANTE-1 (-2-3)
The chord which precedes the DOMINANT in its normal resolution to the TONIC
          (Tr- the chord of "ii"),
     the Ante-2 (Tr- the chord of "vi") precedes the Ante-1, and
     the Ante-3 (Tr- the chord of "iii") precedes the Ante-2.

ANTICIPATION
The displacement of a note in TIME, by placing (performing) it sooner than its normal, original position

AUGMENTATION
A form of Chromaticism (a Transformation in Harmony)

AUGMENTED
Tr- Larger, see Interval