juncture

The act of joining or the condition of being joined.

A place where two things are joined; a junction or joint.

A point in time, especially one requiring a decision to be made.

The transition or mode of transition from one sound to another in speech.

In geometry, either the instantaneous union of a collection of objects which are just moving in coincidence of place, thereafter to be for some lapse of time one object, or the instantaneous loss of one or more dimensions by the gradual shrinkage of a body, this smaller dimensionality lasting through a period of time.