1. Full of life and energy; vigorous.
Examples:
* "a vibrant city"
* "a vibrant personality"
2. (of colour) strong and bright.
Examples:
* "vibrant colours"
* "a vibrant shade of blue"
3. (of a sound) full and strong.
Examples:
* "the vibrant music of the orchestra"
* "a vibrant hum"
You can also find these definitions on various online dictionaries, such as Merriam-Webster, Oxford Dictionaries, and Dictionary.com.