to bring or come (something) to an end, esp in a particular way or with a particular action
Let us conclude the meeting with a prayer
to arrive at (an opinion), esp by logical inference or reasoning
I concluded that her argument was sound
to come to an agreement on (something, e.g. a deal or treaty)
to end
[Middle English concluden from Latin concludere to shut up, end, infer, from con- + claudere to shut]