signal

noun1 of 2

An action, change, or process that gives information about something

• “It's dangerous to ignore the signal at a level crossing.”Tatoeba
• “An agreed-upon signal needs to be come up with.”Tatoeba

Sentences from Tatoeba show real usage. A word can have several meanings, so a sentence may use another one.

adjective2 of 2

Standing above others in rank, importance, or achievement.