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In a calculus course I came across a latin phrase that puzzelled me.
The phrase was "omnia linae" and was translated as all lines. The context of the phrase fits well for the translation of the feminine noun linea (geometric line, perpendicular) and I know that omnis is a third declension adjective. Shouldn't the phrase be either "omnia lina" or "omnes linae"?
The normal word for line in mathematics is linea, -ae, f. and omnia can only be neuter plural. So if it's any consolation, I'm puzzled too. "All lines" should be either omnes lineae or linea omnis.