Real Dictionary

-person
-person is added to numbers to form adjectives which indicate how many people are involved in something or can use something. People is not used in this way.

-person in American English
person of either sex in a (specified) activity, of a (specified) kind, etc.
combining form: a combining form of person, replacing in existing compound words such paired, gender-specific forms as -man and -woman or -er and -ess

-person in British English
suffix forming nouns: sometimes used instead of -man and -woman or -lady

person
countable noun: A person is an individual human being.
plural noun: Persons is used as the plural of person in formal, legal, and technical writing.

person in American English
a human being, esp. as distinguished from a thing or lower animal; individual man, woman, or child
noun: a human being, whether man, woman, or child

person in British English
noun: an individual human being
noun: any of the three hypostases existing as distinct in the one God and constituting the Trinity. They are the First Person, the Father, the Second Person, the Son, and the Third Person, the Holy Ghost

person- in American English
person (of either sex)