(1) Debts entitled to payment before general creditors in bankruptcy. (2) The right held by a creditor by virtue of a lien or security to be satisfied out of the debtor's assets before other creditors. (3) Those things which must be dealt with before others.
The order in which things appear on the screen, the graphic with the highest priority will be at the front, whilst the lowest priority will be behind it, say for example, a ship having a higher priority than the background, it would appear on top of it.
Priorities are issues that you consider more urgent than other things. Priorities can be national and set by the Government. They can also be local, agreed between local organisations or communities, or decided internally.