/jot/ , v. , jotted, jotting , n.
v.t.
1. to write or mark down quickly or briefly (usually fol. by down ): Jot down his license number.
n.
2. the least part of something; a little bit: I don't care a jot.
3. not a jot or tittle , not a bit; not at all: The world situation matters not a jot or tittle to him.
[ 1520-30; earlier iot, iote iota iôta IOTA ]