what's priority date mean?

for EB3, is this mean the 485 filling date or the priority date show on the 485 receipt?

thank you, so confused by this questions, because i saw VSC already process 485 to jun 19 2003, but the priority for the visa number is jan 1 2002,

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• The priority date (PD) for EB3 -北方野狼- ♂ (141 bytes) () 01/18/2005 postreply 19:46:31