American Dictionary of the English Language

POSTER'ITY, noun [Latin posteritas, from posterus, from post, after.]

1. Descendants; children, children's children, etc. indefinitely; the race that proceeds from a progenitor. The whole human race are the posterity of Adam.

2. In a general sense, succeeding generations; opposed to ancestors.

To the unhappy that unjustly bleed,

Heav'n gives posterity t' avenge the deed.