jot (n.) Look up jot at Dictionary.com
1520s, borrowing of Latin jota, variant spelling of Greek iota "the letter -i-," the smallest letter in the alphabet, hence the least part of anything (see iota).
jot (v.) Look up jot at Dictionary.com
"to make a short note of," 1721, from jot (n.). Related: Jotted; jotting.