Knight (noun)

1. A mounted warrior in former times, typically one of noble birth trained to arms and chivalry; a member of the nobility.
2. A person awarded a non-hereditary title by a sovereign in recognition of merit.

Origin:

Old english cniht "boy, servant", of germanic origin; related to dutch knecht and german knecht.

Examples:

1. King Arthur and his knights of the Round Table.
2. Sir Lancelot was one of the bravest knights in the kingdom.
3. He was made a knight in the Queen's Birthday Honours List.
4. Knights wore a suit of armor and rode horses into battle.
5. The knight used his sword to defend the kingdom against invaders.