Tinder (noun)

1. Material, such as dry twigs or paper, used to start a fire by providing a spark.
2. A dating app that allows users to like or dislike other users by swiping right or left on their profile.

Origin:

Middle english: from old french tendre, from latin tendere "to stretch, extend".

Examples:

1. He used dry leaves as tinder to start the fire.
2. The tinder caught fire easily.
3. He found a match and lit the tinder.
4. She met her husband on tinder and they've been happily married for two years.
5. He used tinder to find a date for the weekend.