1. Existing for a long time
   "a long-lasting friendship"
   - durable, lasting, long-lived

See also: long

• three-dimensional radar
• three-dimensionality
• three-figure
• three-fourths
• three-hitter
• three-hundredth
• three-lane
• three-legged
• three-lipped
• three-lobed
• three-membered
• three-mile limit
• three-needled
• three-party
• three-petaled
• three-petalled
• three-piece
• three-piece suit
• three-ply
• three-point landing
• three-point switch
• three-point turn
• three-pronged
• three-quarter binding
• three-quarters