Definitions:

1. a fact that logically justifies some premise or conclusion noun
   • There is reason to believe they are lying.
2. a rational motive for a belief or action noun
   • the reason that war was declared
3. an explanation of the cause of some phenomenon noun
   • the reason a steady state was never reached was that the back pressure built up too slowly
4. the capacity for rational thought or inference or discrimination noun
   • Some people think that humans are endowed with reason and capable of distinguishing good from evil.
5. think logically verb
   • The children must learn to reason

Synonyms:

• argue
• cause
• conclude
• ground
• reason out
• reasonableness
• understanding

NearBy Words:

• reasonable
• reasonableness
• reasonably
• reasoned
• reasoner
• reasoning
• reasonless