Why are they called Janus words?

Why are auto-antonyms called Janus words? Because Roman god Janus is usually shown with two faces looking in opposite directions, and that “oppositeness” represents the opposite meanings of these words. January gets its name from the same Roman god because as the god of doorways and archways, he’s also thought of as looking into the past and the future and representing transitions: the transition from the old year to the new year.

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