1. an extremely large and luminous star that is much bigger and brighter than the sun
Usage: astronomy
2. something that is exceptionally large in its category

Examples

• Betelgeuse is a red supergiant star in the constellation Orion.
• The supergiant will eventually explode as a supernova.
• Blue supergiants are among the most massive stars in the universe.
• The company grew into a supergiant in the tech industry.
• This supergiant oil tanker can carry millions of barrels.
• Astronomers discovered a new supergiant star system.
• The retail supergiant dominates the market.