Noun
A figure of speech by which the orator or writer suddenly breaks off from the previous method of his discourse, and addresses, in the second person, some person or thing, absent or present; as, Milton's apostrophe to Light at the beginning of the third book of "Paradise Lost."
The contraction of a word by the omission of a letter or letters, which omission is marked by the character ['] placed where the letter or letters would have been; as, call'd for called.
The mark ['] used to denote that a word is contracted (as in ne'er for never, can't for can not), and as a sign of the possessive, singular and plural; as, a boy's hat, boys' hats. In the latter use it originally marked the omission of the letter e.
Source: Webster's dictionaryA "kudlit" resembling an apostrophe is used above or below a symbol to change the vowel sound after its consonant. Source: Internet
Additionally, many such software programs incorrectly convert a leading apostrophe to an opening quotation mark (e. Source: Internet
Alternatively, typing Control-Z (for Undo) immediately after entering the apostrophe will convert it back to a typewriter apostrophe. Source: Internet
As the letter apostrophe is seldom used in practice, the Unicode standard cautions that one should never assume text is coded thus. Source: Internet
At one time Winchester was one of the Lord's schools, competing in a trilateral cricket tournament with Eton and Harrow ; and for this reason the first cricket eleven is still known as "Lords" (with or without the apostrophe). Source: Internet
As in German, the apostrophe must not be used to indicate the possessive, except when there is already an s, x or z present in the base form, as in Lukas’ bog ("the Gospel of Luke"). Source: Internet