If someone has been co-opted into a group, is he or she necessarily a member of it?
Recently, I came across the following usage description:
If someone is co-opted into a group, they are asked by that group to become a member, rather than joining or being elected in the normal way.
E.g. He was co-opted into the Labour Government of 1964.
(Collins Cobuild Dictionary)
This description does not allow us to infer the person in question was a member of the Labour Government of 1964. Plugging the definition into the above example would derive the following paraphrase:
He was asked to become a member of the Labour Government of 1964.
However, the Oxford Advanced Learner's Dictionary defines "co-opt" as follows:
1 co-opt somebody (onto/into something)
to make sb a member of a group, committee, etc. by the agreement of all the other members
On the other hand, this definition would mandate the inference that the person was a member.
Which is correct? I've asked the question on another form; however, a user there appears to be incapable of noting the differences.