How to sign: the place where something begins, where it springs into being
"the Italian beginning of the Renaissance"; "Jupiter was the origin of the radiation"; "Pittsburgh is the source of the Ohio River"; "communism's Russian root";
Similiar / Same: origin, source, root, rootage
Categories: point
Within this category: birthplace, derivation, fountainhead, headwaters, home, jumping-off place, point source, spring, trail head, wellhead
How to sign: the time at which something is supposed to begin
"they got an early start"; "she knew from the get-go that he was the man for her";
Similiar / Same: commencement, outset, get-go, starting time, showtime, offset, start, kickoff, first
Categories: point, point in time
Within this category: birth, incipiency, terminus a quo, threshold