Please tell me the meaning of this word.

Please tell me the meaning of this word.

What does this word mean?

This ancient artifact is very valuable.

It is very interesting to learn about ancient history.

Believing in the power of defense, we challenged the battle.

He fought to defend the country.

Wey was a feudal state during the Spring and Autumn period.

He fought to defend his family.

Mamoru is my best friend.