Based on or behaving according to what is morally right and fair. adjective
The judge made a just decision.
She is known for her just treatment of all her employees.
Exactly or precisely. adverb
This is just what I was looking for.
The train arrived just on time.
Only or simply. adverb
I just wanted to say hello.
It's just a small scratch.
Very recently; in the immediate past. adverb
I just finished my homework.
She just left the office.
Barely; by a small margin. adverb
He just made it to the meeting on time.
She just managed to catch the bus.