the one noun 2pronoun 1forms 1 noun2 •(informal) A particularly special or compatible person or thing.I knew as soon I met him that John was the one for me and we were married within a month.That car's the one — I'll buy it. •(informal) A particular person destined to save the universe or world; the chosen one.Jesus Christ is the One, the savior.He (Neo) is the One. pronoun1 •The person or thing.Here is the one I want to buy.In formal contexts, we can use 'that' and 'those' as substitutes meaning ‘the one(s)’. formsthe ones