To pretend to be (a different person); to assume the identity of.
To operate with the permissions of a different user account.
To falsely impersonate (another person or occupation) primarily for the purpose of accomplishing something or reaching a goal.
To constitute (a danger, a threat, a risk, etc.).
To assume or maintain a pose; to strike an attitude.
To behave affectedly in order to attract interest or admiration.
To ask; to set (a test, quiz, riddle, etc.).
To place in an attitude or fixed position, for the sake of effect.
Affectation.
Position, posture, arrangement (especially of the human body).