/nee"euh jeen'/ , Geol.
adj.
1. noting or pertaining to an interval of time corresponding to the Miocene and Pliocene epochs and accorded the status of a period when the Tertiary is considered an era. Cf. Paleogene .
n.
2. the Neogene Period or System.
Also, Neocene .
[ 1855-60; NEO- + -gene (see -GEN) ]