1. (physics) having dimension zero; expressable as a pure number not needing any units
   "any ratio of masses is dimensionless"

Encyclopedia: Dimensionless

• daybed
• daybook
• dayboy
• daybreak
• daycare
• daydream
• daydreamer
• daydreaming
• dayflower
• dayfly
• daygirl
• daylight
• daylight robbery
• daylight saving
• daylight savings
• daylight vision
• daylight-saving time
• daylight-savings time
• daylily
• daylong
• daymare
• Daypro
• dayroom
• days
• dayspring