1. To an extraordinary extent or degree
   "he improved greatly"

See also: great

• periodic acid
• periodic apnea of the newborn
• periodic breathing
• periodic edema
• periodic event
• periodic function
• periodic law
• periodic motion
• periodic movement
• periodic sentence
• periodic table
• periodical
• periodical cicada
• periodically
• periodicity
• periodontal
• periodontal disease
• periodontia
• periodontic
• periodontics
• periodontist
• periodontitis
• perioperative
• Periophthalmus
• periosteum