IOTACISM
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Iota and jot were used interchangeably: 'Shall we lose, or sleightly pass by, any iota or tittle of the Booke of God?' (Featly, 1636).

 
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In Othello, Iago says, 'I see this hath a little dash'd your spirits, and Othello replies, 'Not a jot, not a jot'.
 
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