BACKGROUND KNOWLEDGEbackground knowledge · English · Reference checkedReferenceOpen English WordNet 2024oewn2024:lemma:BACKGROUND KNOWLEDGETier 1Ordinal192Pythagorean84Reverse321Reverse Reduction96Standard510Final Large510Ordinal141Reduced60Atbash1325Isopsephy1657Ordinal199Abjad433