1) (usually passive) to attack, cause trouble for, (a person, business etc) in several ways (beset)

2) (especially) an official with authority to examine books, magazines, plays, films etc and to remove anything regarded as immortal or in other ways undesirable (censor)

3) (of words, ways of speaking or writing) used in situations when one must be particularly polite, impersonal, well-educated, traditional etc to give a good impression (formal)

4) (of words, ways of speaking or writing) used in situations when one can be friendly and relaxed (informal)