Middle English: Februarius
Latin Februarius "of Februa"
Latin Februa(s) "Februa" + -arius "ary (pertaining to)"
Latin Februarius mensis "month of Februa"
Latin dies februatus "day of purification"
Februarius had 28 days, until circa 450 BC when it had 23 or 24 days on some of every second year, until Julius when it had 29 days on every fourth year and 28 days otherwise.
Februa is the Roman festival of purification, held on February fifteenth. It is possibly of Sabine origin.
Intercalaris -- inter-calendar month
Latin Intercalaris "inter-calendar" | Latin Mercedonius (popular name) "?"
Intercalaris had 27 days until the month was abolished by Julius Caeser.
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