TANGENCY
contact, tangency
(noun) (electronics) a junction where things (as two electrical conductors) touch or are in physical contact; “they forget to solder the contacts”
tangency
(noun) the state of being tangent; having contact at a single point or along a line without crossing
Source: WordNet® 3.1
Noun
tangency (countable and uncountable, plural tangencies)
The state of being tangent; an instance of (something) being tangent.
Source: Wiktionary
Tan"gen*cy, n.
Definition: The quality or state of being tangent; a contact or touching.
Source: Webster’s Unabridged Dictionary 1913 Edition