1. Hypothetical intelligent beings or inhabitants of the planet Mars.
Usage: Usually capitalized; often used in science fiction contexts; Plural form of Martian

Examples

• In the science fiction novel, the Martians built advanced cities beneath the surface of Mars.
• Scientists have long speculated about whether Martians could have existed billions of years ago.
• The movie depicts Martians as peaceful creatures trying to communicate with Earth.
• Children enjoy reading stories about Martians visiting our planet.
• Early astronomers wondered if Martians might be observing us from their distant world.