1. in case - Adverb
2. in case - Conjunction
if there happens to be need
Source: WordNetI have left orders to be awakened at any time in case of national emergency, even if I'm in a cabinet meeting. Ronald Reagan
God created a number of possibilities in case some of his prototypes failed - that is the meaning of evolution. Graham Greene
I like to keep a bottle of stimulant handy in case I see a snake, which I also keep handy. W. C. Fields
Always carry a flagon of whiskey in case of snakebite and furthermore always carry a small snake. W. C. Fields
Collect promptly, pay slowly; who knows, in case of an accident, you'll pay nothing. Sicilian Proverb
Nicknames are used in case the Devil comes asking for you. Dominican Proverb