1. In synchrony; in a synchronous manner
   "in four-chambered hearts, the two auricles move synchronously"

See also: synchronous

• south-seeking pole
• south-southeast
• Southampton
• southbound
• Southdown
• southeast
• Southeast Asia
• southeast by east
• southeast by south
• southeaster
• southeasterly
• southeastern
• southeastern pocket gopher
• southeastern United States
• southeastward
• southeastwardly
• Southend-on-Sea
• souther
• southerly
• southern
• southern arrow wood
• southern aster
• Southern Baptist
• Southern Baptist Convention
• southern beech