1. [letter] The ninth letter of the basic modern Latin alphabet.
2. [letter] The letter i with a tittle or dot above, in both the upper case and the lower case versions.
3. [symbol] (mathematics) (often in italics or bold) The imaginary unit; a fixed square root of -1. Graphically, i is shown on the vertical (y-axis) plane.
4. [symbol] (engineering) (often in bold) The current flow in a circuit in amperes.
5. [symbol] (mathematics) (programming) A common variable name representing a generic index, especially in loops.
6. [symbol] (IPA) (romanization) close front unrounded vowel.
7. [letter] The ninth letter of the English alphabet, called i and written in the Latin script.
8. [noun] The name of the Latin-script letter I/i.
9. [pronoun] Nonstandard capitalization of I
10. [letter] The letter i without a dot above, in both the upper case and the lower case versions.
11. [symbol] (element symbol) Symbol for iodine.
12. [symbol] (physics) Isotopic spin.
13. [symbol] (license plate codes) Italy
14. [symbol] (physics) (electronics) Electrical current.
15. [symbol] (amino acid) IUPAC 1-letter abbreviation for isoleucine
16. [symbol] (mathematics) (linear algebra) identity matrix
17. [symbol] (analysis) (topology) the (closed) unit interval; [0, 1]
18. [symbol] (inorganic chemistry) Specifying an oxidation state of 1
19. [pronoun] The speaker or writer, referred to as the grammatical subject, of a sentence.
20. [noun] (metaphysics) The ego.
21. [noun] (US) (roadway) interstate
22. [noun] (grammar) Abbreviation of instrumental case.
23. [noun] A nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks).
24. [noun] The smallest whole number or a numeral representing this number; 'he has the one but will need a two and three to go with it'; 'they had lunch at one'.
25. [noun] The 9th letter of the Roman alphabet.
26. [adjective] Used of a single unit or thing; not two or more; '`ane' is Scottish'.
