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One-to-one is used when you talk about transfer or communications. You may use one-to-one when you can identify a source and a destination. For eg., a one-to-one email is one sent from a single person to another, i.e., no ccs or bccs. In maths, a one-to-one mapping maps one element of a set to a unique element in a target set. One-on-one is the correct adjective in your example. See Free ...
Both 'a single' and 'one single' are correct and commonly used phrases in English. They are interchangeable and can be used to emphasize the singularity of an item or person.
From Middle Welsh person, ultimately from Latin persōna (“mask used by actor; role, part, character”), probably via Middle English persoun and Old French persone (“human being”).
There are 21 meanings listed in OED's entry for the noun person, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.
the degree to which one person or thing differs from another: [countable; usually singular] The difference in their ages is about six months. [uncountable] There isn't much difference between one politician and another.