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

Encyclopedia: Dimensionless

• family Carpinaceae
• family Caryocaraceae
• family Caryophyllaceae
• family Castoridae
• family Casuaridae
• family Casuarinaceae
• family Cathartidae
• family Catostomidae
• family Caviidae
• family Cebidae
• family Cecidomyidae
• family Cecropiaceae
• family Celastraceae
• family Centrarchidae
• family Centriscidae
• family Centropomidae
• family Cephalobidae
• family Cephalotaceae
• family Cephalotaxaceae
• family Cerambycidae
• family Ceratodontidae
• family Ceratophyllaceae
• family Ceratopogonidae
• family Ceratopsidae
• family Ceratostomataceae