adjunct

adjunct ('forholdsadverbial'). A type of adverbial indicating the circumstances of the action. Adjuncts may be obligatory or optional. They express such relations as time, place, manner, reason, condition, i.e. they are answers to the questions where, when, how and why. E.g. He lives in Brazil (place adjunct). She was walking slowly (manner adjunct), since she was in no hurry   (adjunct of reason).