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sentinel

noun

/ˈsɛntɪnəl/

Meaning

A soldier or guard whose job is to stand and keep watch.

A sentinel stood at the entrance of the camp.

stand sentinel

guard, watchman, sentry, lookout, protector

intruder, enemy, attacker

sentinel post, sentinel duty, act as sentinel, stand sentinel

The ability of a company or product to retain its customers over some specified period.

Loose soil or unclean matter; anything that makes a surface unclean.

Atoms of the same element with equal number of protons but different numbers of neutrons.

The act of using up resources, goods, or energy; also refers to the eating or drinking of something.

the organ of sight; the ability to see

an assembly of people chosen or elected to make decisions or advise on matters