assume
as·sume
 /əˈsuːm/  verb  , -sumes, -sumed, -sum·ing [  + obj  ]
  1 : to think that something is true or probably true without knowing that it is true
   I assumed he was coming, so I was surprised when he didn't show up.
   “Is he coming?” “So I assume.” = “I assume so.”
   I think we can safely assume that he's coming. = I think it's safe to assume that he's coming.
   She assumed from his expression that he was confused.
   Let's assume [=suppose] (that) she rejects your invitation. What will you do then? = Assuming (that) she rejects your invitation, what will you do? [=what will you do if she rejects your invitation?]
   We'll be arriving around noon. That's assuming that our flight is on time.
   The study assumes that the problem develops after birth. [=the study does not consider the possibility that the problem may begin before birth]
  2 a : to begin (a role, duty, etc.) as a job or responsibility
   She assumed the presidency. = She assumed the position of president.
   assume [=take] office
   The king assumed the throne when he was very young.
  2 b : to take or begin to have (power, control, etc.) in a job or situation
   He is ready to assume [=take] control of the organization.
  3 : to begin to have (a particular appearance or quality)
   The last game of the season assumes much greater importance now. [=it becomes much more important now]
   Their financial problems assumed huge proportions. [=grew to be very serious]
   The sky gradually assumed [=took on] an otherworldly glow.
   Under certain conditions, the chemical will assume the appearance of ice.
  4 a : to make yourself have (an appearance that does not show your true feelings) in order to deceive someone
   She immediately assumed a look of innocence. [=she had an expression on her face that made her look innocent, even though she wasn't]
  4 b : to place yourself in (a particular position or posture)
   She assumed a sitting position [=she sat down] on the floor.
  5 : to accept (a responsibility, debt, etc.)
   When they purchased the company they had to assume [=take on] its debts.
   assume liability
   The city assumes greater financial risk with that plan.