1. Highly significant or important especially bringing about or marking the beginning of a new development or era
   "epochal decisions made by Roosevelt and Churchill"
   - epoch-making

See also: epoch, important, significant

• lowbrow
• lowbrowed
• lowbush cranberry
• lowbush penstemon
• Lowell
• Lowell Jackson Thomas
• Lowell Thomas
• lower
• lower berth
• lower bound
• Lower California
• lower cannon
• Lower Carboniferous
• Lower Carboniferous period
• lower class
• lower court
• lower criticism
• lower deck
• Lower Egypt
• lower jaw
• lower jawbone
• lower limit
• lower mantle
• lower oneself
• Lower Paleolithic