This adverb has two meanings:
 A short time ago:
He and his wife have just arrived here.
 Only:
I just had time to see my mother and sister off.
Sometimes it is not clear which of the two meanings is intended:
I’ve just bought this little flask.
Does this mean that the speaker only bought the flask and nothing else? Or that the speaker has bought it very recently? If you wish to be absolutely precise you may have to replace just, and/or add other words:
I only bought this little flask – nothing else.
I bought this little flask just now.
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