different between valency vs subvalent

English

From Late Latin valentia (“power”)

valency (countable and uncountable, plural valencies) (mostly UK)

(graph theory) The number of edges connected to a vertex in a graph.
Synonym: degree
(especially chemistry) Valence.
(linguistics) The capacity of a verb to take a specific number of arguments.
Synonym: valence
The capacity of something to combine with other things.

sub- +? valent

subvalent (comparative more subvalent, superlative most subvalent)

(physics, chemistry) Exhibiting a valency (oxidation number) that is less than normal

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