- twelfthly
- twelfth ► ORDINAL NUMBER 1) constituting number twelve in a sequence; 12th. 2) (a twelfth/one twelfth) each of twelve equal parts into which something is or may be divided. 3) Music an interval spanning an octave and a fifth in the diatonic scale. 4) (the (Glorious) Twelfth) (in the UK) 12 August, the day on which the grouse-shooting season begins.DERIVATIVES twelfthly adverb.
English terms dictionary. 2015.