1. (n.) The act of placing after, or the state of being placed after.

2. (n.) A word or particle placed after, or at the end of, another word; -- distinguished from preposition.

PS Parthian shot accession accessory accompaniment addenda addendum additament addition additive additory additum adjournal adjournment adjunct adjuvant afterthought annex annexation appanage appendage appendant appendix appurtenance appurtenant attachment augment augmentation back matter chorus coda codicil colophon coming after complement conclusion concomitant consecution consecutiveness consequence continualness continuance continuity corollary deferment deferral descent double take duration dying words endurance envoi epilogue extension extension of time extrapolation fixture follow-through follow-up following increase increment last words lengthening line lineage lingering logical sequence maintenance offshoot order order of succession parting shot pendant peroration perpetuation perseverance persistence posteriority postface postfix postlude postponement postposition postscript procession procrastination progress progression prolongation prorogation protraction pursuance putting-off refrain reinforcement repetition rotation run second thought sequel sequela sequelae sequelant sequence sequent sequitur series side effect side issue staying power straight course subjunction subscript succession successiveness suffix suffixation supplement sustained action sustenance swan song tabling tag tailpiece undergirding uninterrupted course unremittingness way