1. In actuality or reality or fact
   "in effect, they had no choice"
   - effectively

1. Exerting force or influence
   "the law is already in effect (or in force)"
   - effective, good, in force

See also: operative

• eicosapentaenoic acid
• Eid
• eider
• eider duck
• eiderdown
• eidetic
• eidolon
• eidos
• Eiffel
• Eiffel Tower
• Eigen
• eigenstate
• eigenvalue
• eigenvalue of a matrix
• eigenvalue of a square matrix
• eigenvector
• eight
• eight ball
• eight-day
• eight-membered
• eight-sided
• eight-spot
• eighteen
• eighteenth
• Eighteenth Amendment