Where does “spontaneous” come from?

Spontaneous comes from Latin spontaneus, formed from sponte with the suffix -anus, ultimately from Proto-Indo-European -ós.

spontaneous (English): Self-generated; happening without any apparent...

Definitions

  1. Self-generated; happening without any apparent...

Ancestry of “spontaneous”, step by step

StepLanguageWordMeaning
1Latinspontāneusvoluntary, spontaneous
2Latin-āneusforming adjectives Of or pertaining to; -aneous
3Latin-eusargentum + API → argenteus; ferrum + API →...
4Proto-Italic*-eosForms adjectives indicating being formed out of a material

Words derived from “spontaneous”

Every word from Proto-Italic *-eos →Every word from Latin -eus →Every word from Latin -āneus →