noun

• (by extension, chiefly in the negative) A small, or the smallest, amount of a thing; a bit, a whit.
  "He didn’t care a jot for his work."
• (by extension, chiefly in the negative) A small, or the smallest, amount of a thing; a bit, a whit.
  "So vveake my povvres, ſo ſore my vvounds appeare, / that vvonder is hovv I ſhould liue a iot, / ſeeing my hart through launched euery vvhere / vvith thouſand arrovves, vvhich your eies haue ſhot: […]"

verb

• (transitive) Chiefly followed by down: to write (something) quickly; to make a brief note of (something).
  "Tell me your order so I can jot it down."

verb

• (transitive, obsolete except British, dialectal) To jerk or jolt (something); to jog.
  "Nowe is iuſte iuſtice, ſo iotted out of iointe, / That ye here vniuſtely, ſtande at deniall, / To do me iuſtice, and wolde by power ryall: / Directe mine acquitall or condemnacion, / Euen as wyll in both: weith your acceptacion."

noun

• (obsolete, rare) A jerk, a jolt.
  "[F]requent jot / Of his hard ſetting jade did ſo confound / The vvords that he by papyr-ſtealth had got, / That their loſt ſenſe the youngſter could not ſound, / Though he vvith mimical attention did abound."