One-to-one or one to one may refer to: == Mathematics and communication == One-to-one function, also called an injective function One-to-one correspondence, also called a bijective function One-to-one (communication), the act of an individual communicating with another One-to-one (data model), a relationship in a data model One to one computing (education), an initiative for a computer for every student One-to-one marketing or personalized marketing, an attempt to make a unique product offering for each customer == Music == One to... [more on Wikipedia]