Illustrated Glossary of Organic Chemistry

Para: The relationship between two benzene ring substituents on two benzene ring carbons separated by two benzene ring carbons.

The relationship of two benzene ring substituents can be described as ortho, meta, or para.

Ortho-dibromobenzene o-dibromobenzene 1,2-dibromobenzene		Meta-nitrotoluene m-nitrotoluene 3-nitrotoluene		Para-xylene p-xylene 1,4-dimethylbenzene