To take by choice into relationship, as, child, heir, friend, citizen, etc.; esp. to take voluntarily (a child of other parents) to be in the place of, or as, one's own child.
- To take into one's family through legal means and raise as one's own child.
- To take and follow (a course of action, for example) by choice or assent: adopt a new technique.
- To take up and make one's own: adopt a new idea.
- To take on or assume: adopted an air of importance.
- To vote to accept: adopt a resolution.
- To choose as standard or required in a course: adopt a new line of English textbooks.