English
equivalentist
From equivalent + -ist.
Formed from equivalent + -ist
Proto-Indo-European *h₂welh₁-
…
Proto-Italic *walēō ‘to be strong’
Latin valeō ‘to have strength’
Latin aequivaleō ‘to be equivalent’
Latin aequivalēns ‘equivalent’
English equivalent
Today it means
noun Any of a group of people who proposed a system of atomic weights based on combining equivalents
Language periods are conventional ranges, not dates for this word.
Etymograph / equivalentist