1. Long past; beyond the limits of memory or tradition or recorded history
   "time immemorial"

See also: old

• Decadron
• decaf
• decaffeinate
• decaffeinated coffee
• decagon
• decagonal
• decagram
• decahedron
• decal
• decalcification
• decalcify
• decalcomania
• decalescence
• decalescent
• decaliter
• decalitre
• Decalogue
• decameter
• decametre
• decamp
• decampment
• decanal
• decane
• decanedioic acid
• decani