Conforming to established standards of behavior or manners; correct or decorous. adjective
It is proper to address the judge as 'Your Honor'.
She wore a proper dress for the formal event.
Belonging or relating exclusively or distinctively to; particular to. adjective
The proper function of the heart is to pump blood.
This book is proper to the field of biology.
Strictly so called; in its true form. adjective
The city proper is quite small, but the metropolitan area is vast.
The castle proper was surrounded by a large moat.
Thoroughly or completely; used informally to emphasize. adverb
He was proper annoyed when he found out the truth.
The meal was proper delicious, leaving everyone satisfied.