- Indicates the possessive case of singular and plural nouns, indefinite pronouns, and surnames combined with designations such as Jr., Sr., and II: my sister's husband, my three sisters' husbands, anyone's guess, They answer each other's phones, John Smith, Jr.'s car.
- Indicates joint possession when used with the last of two or more nouns in a series: Doe and Roe's report.
- Indicates individual possession or authorship when used with each of two or more nouns in a series: Smith's, Roe's, and Doe's reports.
- Indicates the plurals of words, letters, and figures used as such: 60's and 70's; x's, y's, and z's.
- Indicates omission of letters in contractions: aren't, that's, o'clock.
- Indicates omission of figures in dates: the class of '63.
See also: Apostrophes.
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