Webster’s Revised Unabridged Dictionary · 1913
Subjoin
Sub·join′ (sŭb·join′), v. t. [imp. & p. p. Subjoined; p. pr. & vb. n. Subjoining.] [Cf. OF. subjoindre, L. subjungere. See Sub-, and Join, and cf. Subjective.] To add after something else has been said or written; to ANNEX; as, to subjoin an argument or reason.
Syn. — To add; annex; join; unite.