A member or follower of any of the Western Christian churches that are separate from the Roman Catholic Church and follow the principles of the Reformation, including the Baptist, Presbyterian, and Lutheran churches.

As a Protestant, she attended a Lutheran church every Sunday.

A person who publicly demonstrates opposition or objection; a protester (archaic or rare).

The square was filled with protestants demanding political reform.

protestantadjective

Relating to or characteristic of the Protestant branch of Christianity (usually capitalised).

The Protestant church held a service to commemorate the Reformation.

Expressing protest or dissent; protesting (archaic or rare).

His protestant attitude toward the new tax laws inspired others to speak out.