1. Being in effect or operation
   "bus service is in operation during the emergency"
   - operational, operating

See also: operative

• economical
• economically
• economics
• economics department
• economics profession
• economise
• economiser
• economist
• economize
• economizer
• economy
• economy class
• economy of scale
• ECOSOC
• ECOSOC commission
• ecosphere
• ecosystem
• ecoterrorism
• ecotourism
• ecotown
• ecotoxicology
• ecotype
• ecovillage
• ecphonesis
• ecrevisse