1. Being of the nature of a notion or concept
   "a plan abstract and conceptional"
   - ideational, notional

See also: abstract, conception

• tree ring
• tree shrew
• tree sloth
• tree sparrow
• tree squirrel
• tree stump
• tree surgeon
• tree surgery
• tree swallow
• tree swift
• tree toad
• tree tobacco
• tree tomato
• tree trunk
• tree wallaby
• tree-frog
• tree-living
• tree-shaped
• tree-worship
• treed
• treehopper
• treeless
• treelet
• treelike
• treen