lightweight

What is the Definition of lightweight?

Noun:

1. a professional boxer who weighs between 131 and 135 pounds
2. someone who is unimportant but cheeky and presumptuous
3. an amateur boxer who weighs no more than 132 pounds
4. a wrestler who weighs 139-154 pounds

Adjective:

1. weighing relatively little compared with another item or object of similar use
2. having no importance or influence

Other meanings of lightweight (synonyms, cognates).