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Unit of time once based on the orbital period of Earth but now the transition in caesium; a gearbox ratio; or, a duellist's attendant

Let's find possible answers to "Unit of time once based on the orbital period of Earth but now the transition in caesium; a gearbox ratio; or, a duellist's attendant" crossword clue. First of all, we will look for a few extra hints for this entry: Unit of time once based on the orbital period of Earth but now the transition in caesium; a gearbox ratio; or, a duellist's attendant. Finally, we will solve this crossword puzzle clue and get the correct word. We have 1 possible solution for this clue in our database.