1. 撇号，省字号，所有格符号（符号为’）
An apostrophe is the mark ' when it is written to indicate that one or more letters have been left out of a word, as in 'isn't' and 'we'll'. It is also added to nouns to form possessives, as in 'Mike's car'.

1. the mark (') used to indicate the omission of one or more letters from a printed word

2. address to an absent or imaginary person