From the same as genea; nativity; figuratively, nature -- generation, nature(-ral).
see GREEK genea
1. source, origin: βίβλος γενέσεως τίνος a book of one's lineage, i. e. in which his ancestry or his progeny are enumerated (equivalent to תּולְדות סֵפֶר, Genesis 5:1, etc.) (Matthew 1:1).
2. used of birth, nativity, in Matthew 1:18 and Luke 1:14, for Rec. γέννησις (ἡμέραι τῆς γενέσεως μου equivalent to ἀφ' οὗ ἐγεννήθην, Judith 12:18 cf. 20); πρόσωπον τῆς γενέσεως his native (natural) face, James 1:23.
3. of that which follows origin, viz. existence, life: ὁ τροχός τῆς γενέσεως the wheel (cf. English machinery) of life, James 3:6 (cf. Grimm on Sap. vii. 5); but others explain it the wheel of human origin which as soon as men are born begins to run, i. e. the course (cf. English round) of life.