Source : Webster's Revised Unabridged Dictionary (1913)

Subjunction \Sub*junc"tion\, n. [See {Subjunctive}.]
   1. Act of subjoining, or state of being subjoined.

   2. Something subjoined; as, a subjunction to a sentence.

Source : WordNet®

subjunction
     n : the act of supplementing [syn: {supplementation}, {subjoining}]