What is the meaning of just?

adjective

• Used especially of what is legally or ethically right or proper or fitting.
  • usage: "a just and lasting peace- A. Lincoln; "a kind and just man"; "a just reward"; "his just inheritance"
• Fair to all parties as dictated by reason and conscience.
  • usage: "equitable treatment of all citizens"; "an equitable distribution of gifts among the children"
  • synonyms: equitable
• Free from favoritism or self-interest or bias or deception; conforming with established standards or rules.
  • usage: "a fair referee"; "fair deal"; "on a fair footing"; "a fair fight"; "by fair means or foul"
  • synonyms: fair
• Of moral excellence.
  • usage: "a genuinely good person"; "a just cause"; "an upright and respectable man"
  • synonyms: good, upright

adverb

• And nothing more.
  • usage: "I was merely asking"; "it is simply a matter of time"; "just a scratch"; "he was only a child"; "hopes that last but a moment"
  • synonyms: merely, simply, only, but
• Indicating exactness or preciseness.
  • usage: "he was doing precisely (or exactly) what she had told him to do"; "it was just as he said-the jewel was gone"; "it has just enough salt"
  • synonyms: precisely, exactly
• Only a moment ago.
  • usage: "he has just arrived"; "the sun just now came out"
  • synonyms: just now
• Absolutely.
  • usage: "I just can't take it anymore"; "he was just grand as Romeo"; "it's simply beautiful"
  • synonyms: simply
• Only a very short time before."they could barely hear the speaker"; "we hardly knew them"; "just missed being hit"; "had scarcely rung the bell when the door flew open"; "would have scarce arrived before she would have found some excuse to leave- W. B. Yeats
  • synonyms: barely, hardly, scarcely, scarce
• Exactly at this moment or the moment described.
  • usage: "we've just finished painting the walls, so don't touch them";