iota

柯林斯词典

1. QUANT If you say that there is not an iota or not one iota of something, you are emphasizing that there is not even a very small amount of it. 一點兒; 極小的量[with brd-neg, QUANT 'of' n-uncount] [強調]
He's never shown an iota of interest in any kind of work. 他對任何一種工作都沒有表現出一點兒興趣。
2. PHRASE You can use an iota or one iota to emphasize a negative statement. Not an iota or not one iota means not even to a small extent or degree. 絲毫的[with brd-neg, PHR after v] [強調]
Our credit standards haven't changed one iota. 我們的信貸標準從未有絲毫改變。