English

heptavalency

From hepta- + valency.

Proto-Indo-European *septḿ̥ ‘seven’

Proto-Hellenic *heptə́ ‘seven’

Ancient Greek ἑπτά ‘seven’

Proto-Indo-European *h₂welh₁-

…

Proto-Italic *walēō ‘to be strong’

Latin valeō ‘to be well, healthy, sound’

Latin valēns ‘strong, healthy’

Late Latin valentia

Today it means

noun The condition of being heptavalent

Language periods are conventional ranges, not dates for this word.

Etymograph / heptavalency