Where does “semispontaneous” come from?

semispontaneous (English) comes from English spontaneous, from Latin spontāneus, from Latin -āneus, from Latin -eus, from Proto-Italic *-eos — Forms adjectives indicating being formed out of a material.

semispontaneous (English): Partly spontaneous

Definitions

  1. Partly spontaneous

Ancestry of “semispontaneous”, step by step

semispontaneous traces back through two separate lines of ancestry.

via English spontaneous

StepLanguageWordMeaning
1EnglishspontaneousSelf-generated; happening without any apparent...
2Latinspontāneusvoluntary, spontaneous
3Latin-āneusforming adjectives Of or pertaining to; -aneous
4Latin-eusargentum + API → argenteus; ferrum + API →...
5Proto-Italic*-eosForms adjectives indicating being formed out of a material

via English semi

StepLanguageWordMeaning
1EnglishsemiA semi-detached house; A semitrailer; a...
2Englishsemi-half; partial, incomplete; somewhat, rather,...
3Latinsēmi-half
4Proto-Indo-Europeansēmihalf; partially
Every word from Proto-Italic *-eosEvery word from Latin -eusEvery word from Latin -āneus