- the ninth letter and third vowel of the modern English alphabet
- any of several speech sounds represented by this letter, in English as in bite or hit
- something shaped like an I
- (in combination): an I-beam
WordReference Random House Learner's Dictionary of American English © 2017
- any of the numerals in the ancient Roman system of notation, still used occasionally. The basic symbols are I (=1), V (=5), X (=10), L (=50), C (=100), D (=500), and M (=1000).
thus, X̄ equals 10,000. Integers are written according to these two rules: If a letter is immediately followed by one of equal or lesser value, the two values are added;
thus, XX equals 20, XV equals 15, VI equals 6. If a letter is immediately followed by one of greater value, the first is subtracted from the second;
thus, IV equals 4, XL equals 40, CM equals 900. Examples: XLVII(=47), CXVI(=116), MCXX(=1120), MCMXIV(=1914). Roman numerals may be written in lowercase letters, though they appear more commonly in capitals.
- the imaginary number √–1
- (subjective) refers to the speaker or writer
- (Roman numeral) one
See Roman numerals
- Island or Isle