(in electrical engineering and electronics) the imaginary quantity equal to the square root of minus one.Compare with i
1The tenth letter of the alphabet.
- 1.1Denoting the next after I (or H if I is omitted) in a set of items, categories, etc.
2JA shape like that of a capital J (without a crosspiece).
3archaic Used instead of I as the Roman numeral for one in final position.
- ‘between ij and iij of the clock’
1Jack (used in describing play in card games).
2Japan (international vehicle registration).
4(in titles) Journal (of)
- ‘J. Biol. Chem’