1. The act of referring; SYN. consultation.
2. The relation between a word or phrase and the object or idea it refers to
3. The class of objects that an expression refers to; SYN. denotation, extension.
4. A publication (or a passage from a publication) that is referred to; SYN. source.

Used or usable for reference; especially; constituting a standard for measuring or constructing

A data type in the C++ programming language. A reference must be initialized with a variable name. The reference then becomes an alias for that variable but actually stores the address of the variable.

To refer to; SYN. cite.

To access a variable, such as an element in an array or a field in a record.