One who or that which has corresponding functions or characteristics.
Either of two parts that fit together, or complement one another.
One who or that which resembles another.
A duplicate of a legal document.
Either half of a flattened fossil when the rock has split along the plane of the fossil.
To counterbalance.
A term that may sometimes be used to describe the case marking a predicative nominative (a noun that renames the subject often following a linking verb), or for the adjective that agrees with it (predicative adjective).