noun
plural -sions
[count] :a final decision or judgment :an opinion or decision that is formed after a period of thought or research
To jump/leap to conclusions is to make judgments too quickly before knowing all the facts.
[count] :the last part of something :end
usually singular
the act of concluding or finishing something or the state of being finished [singular]
in conclusion
used to introduce the final comments at the end of a speech or a piece of writing