subjoin (v.) Look up subjoin at Dictionary.com
"add to the end of," 1570s, from Middle French subjoin-, past participle stem of subjoindre, from Latin subiungere "to append, add at the end, place under," from sub "under" (see sub-) + iungere "to join together" (from nasalized form of PIE root *yeug- "to join"). Related: Subjoined; subjoining.