Gratitude (noun)

1. The quality of being thankful; readiness to show appreciation for and to return kindness.
2. A feeling of thankfulness and appreciation.

Origin:

Late middle english: from old french gratitude, or via latin from gratus "pleasing".

Examples:

1. She expressed her gratitude for the help.
2. He felt a deep sense of gratitude towards his parents.
3. Gratitude is a key component of happiness.
4. The letter was written in gratitude for the gift.
5. The student expressed gratitude to the teacher for their support.