happening, natural event, occurrence - an event that happens

encounter, meeting - a casual or unexpected convergence; "he still remembers their meeting in Paris"; "there was a brief encounter in the hallway"

series - (mathematics) the sum of a finite or infinite sequence of expressions

crossroads - a point where a choice must be made; "Freud's work stands at the crossroads between psychology and neurology"

interface - the overlap where two theories or phenomena affect each other or have links with each other; "the interface between chemistry and biology"

internal representation, mental representation, representation - a presentation to the mind in the form of an idea or image

joining, connexion, connection - the act of bringing two things into contact (especially for communication); "the joining of hands around the table"; "there was a connection via the internet"

merging, coming together, meeting - the act of joining together as one; "the merging of the two groups occurred quickly"; "there was no meeting of minds"