1) referring to people who leave a course of study, membership of a society etc (fall-out)

2) not influenced by personal feelings; not referring to any particular person (impersonal)

3) of, for, done by, people who are not members of the clergy; not professional (especially referring to law or medicine); to put (something) on, over etc something (lay)

4) extraordinary or unusual (often referring to a large degree or size) (phenomenal)

5) (used by a speaker or writer referring to herself or himself and another or others) (we)