"a person's offspring, descendants collectively," late 14c., posterite, from Old French posterité (14c.), from Latin posteritatem (nominative posteritas) "future, future time; after-generation, offspring;" literally "the condition of coming after," from posterus "coming after, subsequent," from post "after" (see post-). Old English words for this included æftercneoreso, framcynn.
we must secure the benefits of freedom for ourselves and our posterity
postdiluvial
posted
poster
posterior
posteriority
posterity
postern
post-glacial
post-graduate
post-haste
post-hole