assume /əˈsjuːm/ verb [T]
› to think that something is likely to be true, although you have no proof: [+ (that)] Everything was quiet when I got home so I assumed that you had gone out.
assume control/power/responsibility, etc › to take a position of control/power/responsibility, etc: He has assumed the role of spokesman for the group.
assume an air/expression, etc formal › to pretend to have a feeling that you do not have
assume a false identity/name, etc › to pretend to be someone else: an assumed name