礼(れい)

れい
noun
bow, thanks, manners
society
See also: 例(れい) (example, instance)
1. bow
A gesture of respect made by bending the body.
礼(れい)をする。
To bow.
I greeted them with a deep bow.
I bowed to the teacher before leaving the classroom.
You bow to your opponent before the match.
Please bow when the president comes in.
2. thanks, gratitude
An expression of appreciation.
To express thanks.
Please don't forget to thank them for helping you.
This is a token of my gratitude.
3. manners, etiquette
Proper behavior and customs.
People who don't know manners are disliked.
I want to learn Japanese etiquette.
I asked with the utmost courtesy.
It was an attitude lacking in manners.
He is a person who values etiquette.

Common expressions

Compounds

Watch out

In the thanks sense the word is almost always お礼(れい): お礼(れい)を言(い)う (to thank), not 礼(れい)を言(い)う in everyday speech. Bare 礼(れい) usually means the bow (礼(れい)をする), as in the school command 起立(きりつ)、礼(れい) (stand, bow).