Where does “underapproximation” come from?

underapproximation (English) comes from English approximation, from English -ion, from Ancient Greek ἀπόγειον, from Ancient Greek ἀπό, from Ancient Greek Ἥλιος, from Ancient Greek τύπος, from Ancient Greek τύπτω, from Proto-Indo-European (s)tewp- — to push, to hit.

underapproximation (English): An approximation that is lower than the true...

Definitions

  1. An approximation that is lower than the true...

Ancestry of “underapproximation”, step by step

underapproximation traces back through two separate lines of ancestry.

via English approximation

StepLanguageWordMeaning
1EnglishapproximationThe act, process or result of approximating; An...
2English-ionan action or process, or the result of an action...
3Ancient Greekἀπόγειονapogee, greatest distance from the Earth
4Ancient Greekἀπόfrom, away from; because of, as a result of
5Ancient GreekἭλιοςsun
6Ancient GreekτύποςA blow, pressing; The results of a blow: mark,...
7Ancient Greekτύπτωto beat, strike, smite; to beat, strike oneself
8Proto-Indo-European(s)tewp-to push, to stick
9Proto-Indo-European(s)tew-to push, to hit

via English under

StepLanguageWordMeaning
1EnglishunderIn or at a lower level than; As a subject of;...
2Middle Englishunderunder
3Old Englishunderunder, beneath
4Proto-Germanicunderamong, between; under, beneath; under
5Proto-Indo-Europeanh₁entérbetween
6Proto-Indo-Europeanh₁enin; in, inside
Every word from Proto-Indo-European (s)tew-
underapproximation — Etymology, Origin & Word History | Etymology Explorer