Questions about example sentences with, and the definition and usage of "Oppositional"

A: Oppositional: characterised by resistance or dissent
e.g. 'Nowadays, many people take an oppositional stance to animal testing'

Oppositionary means the same as oppositional but is much less common and recognised by fewer dictionaries.

They are modern words, normally used in relation to politics, rare in everyday speech.

A: The survey’s findings indicate that the main oppositional party is constantly ahead in the prospective election for presidency.