1.NounA 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.; Jesus Christ is the One, the savior.; He (Neo) is the One.; They, like me, believe him (Anakin Skywalker) to be The One."
2.NounA particular person destined to save the universe or world; the chosen one.
"Jesus Christ is the One, the savior.; He (Neo) is the One.; They, like me, believe him (Anakin Skywalker) to be The One."
3.PronounThe 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)’."