| 释义 |
Collins Concise English Dictionary © HarperCollins Publishers:: x, X /ɛks/ n ( pl x's, X's, Xs)- the 24th letter and 19th consonant of the modern English alphabet
- a speech sound sequence represented by this letter, in English pronounced as ks or gz or, in initial position, z, as in xylophone
x symbol for - ex
- the x-axis or a coordinate measured along the x-axis in a Cartesian coordinate system
- an algebraic variable
ˈRo•man ˈnu•mer•al, n. [countable]- 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).
WordReference Random House Unabridged Dictionary of American English © 2024Ro′man nu′merals, - the numerals in the ancient Roman system of notation, still used for certain limited purposes, as in some pagination, dates on buildings, etc. The common basic symbols are I (=1), V (=5), X (=10), L (=50), C (=100), D (=500), and M (=1000). The Roman numerals for one to nine are: I, II, III, IV, V, VI, VII, VIII, IX. A bar over a letter multiplies it by 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.
Collins Concise English Dictionary © HarperCollins Publishers:: X symbol for - (formerly, in Britain) indicating a film that may not be publicly shown to anyone under 18. Since 1982 replaced by symbol 18
- (as modifier): an X film
- denoting any unknown, unspecified, or variable factor, number, person, or thing
- (on letters, cards, etc) denoting a kiss
- (on ballot papers, etc) indicating choice
- (on examination papers, etc) indicating error
- for Christ; Christian
- (Roman numeral) ten
See Roman numerals
Etymology: (sense 6) from the form of the Greek letter khi (Χ), first letter of Khristos Christ |