tangency

nouns

the state of being tangent; having contact at a single point or along a line without crossing
tangency
is derived from
tangent
is a type of (narrower)
the state or condition of touching or of being in immediate proximity
"litmus paper turns red on contact with an acid"
contact
(electronics) a junction where things (as two electrical conductors) touch or are in physical contact
"they forget to solder the contacts"
contact, tangency