Iota
Definition 1 of 2
Pro Tip 1/3
Emphasizing Negligibility
Use 'iota' to stress the negligible degree of something when making comparisons or arguments. There isn't an iota of truth in his excuse.
Pro Tip 2/3
Colloquial Emphasis
'Not one iota' is a common phrase used to emphasize a total lack of something. She didn't show one iota of remorse.
Pro Tip 3/3
Understatement
'Iota' can understate the significance of something, often for ironic or humorous effect. I have an iota of a chance to win the lottery.