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The Collaborative International Dictionary
Subaction

Subaction \Sub*ac"tion\, n. [Cf. L. subactio a working up, discipline.] The act of reducing to any state, as of mixing two bodies combletely. [Obs.]
--Bacon.

Wiktionary
subaction

Etymology 1 n. (context obsolete English) The act of reduce to any state, as of mixing two bodies completely. Etymology 2

n. An action that makes up part of a more complex action.