Webster's English Dictionary

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detent

de.tent \'de--.tent, di-'tent\ n [F de`tente, fr. MF destente, fr. 
   destendre to slacken, fr.]OF, fr. des- de- + tendre to stretch, fr. L 
   tendere - more at THIN : a mechanism that locks or unlocks a movement (as 
   of a clock)