Proper (adjective)

1. Correct, suitable, or appropriate for a particular situation or purpose.
2. Suitable or appropriate in manners, behavior, or etiquette.
3. Belonging to or associated with a particular person, place, or thing.
4. Formally or officially recognized or established.
5. Complete or full in every aspect or aspect.

Origin:

The word 'proper' comes from the latin word 'proprius' which means 'one's own, personal, or inherent.'.

Examples:

1. The proper way to hold a fork and knife while eating.
2. It is proper to arrive at a dinner party on time.
3. The proper attire for a wedding is formal wear.
4. The proper name of the city is New York.
5. It is proper to say thank you when receiving a gift.