1. Based on the system of having only one member from each district (as of a legislature)
   - uninominal

See also: single

• common carline thistle
• common carotid
• common carotid artery
• common carrier
• common chickweed
• common chord
• common cockscomb
• common cold
• common comfrey
• common coral tree
• common corn salad
• common cotton grass
• common daisy
• common dandelion
• common denominator
• common devil's claw
• common divisor
• common dogbane
• common dolphin
• common duckweed
• common eel
• common eland
• common elder
• Common Era
• common European ash