plural noun Mathematics.
a system of coordinates in which the axes do not meet at right angles.
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How To Use Common Punctuation MarksA discussion of each mark follows, in alphabetical order by name of mark. Also includes how to divide words; use of numerals/numbers; possessives; and common errors in punctuation. Apostrophe (‘) is used to indicate possession, contractions, and plurals. Possession: The possessive form of singular nouns ends in ‘s, including nouns ending in s, x, z, ch, or sh. For example: a dog’s life, a lass’s smile. The apostrophe …
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