ADJECTIVE:

Honorable and fair in one's dealings and actions: a just ruler. See Synonyms at fair 1.
Consistent with what is morally right; righteous: a just cause.
Properly due or merited: just deserts.
Law Valid within the law; lawful: just claims.
Suitable or proper in nature; fitting: a just touch of solemnity.
Based on fact or sound reason; well-founded: a just appraisal.
ADVERB:
(jst, jst; jst when stressed)
Precisely; exactly: just enough salt.
Only a moment ago: He just arrived.
By a narrow margin; barely: just missed being hit; just caught the bus before it pulled away.
At a little distance: just down the road.
Merely; only: just a scratch.
Simply; certainly: It's just beautiful!
Perhaps; possibly: I just may go.

IDIOMS:
just about
Almost; very nearly: This job is just about done.
just now
Only a moment ago.
just the same
Nevertheless.

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ETYMOLOGY:
Middle English juste, from Old French, from Latin istus; see yewes- in Indo-European roots

OTHER FORMS:
justly (Adverb), justness (Noun)