c. 1500, "having the rank of a prince; pertainin or belonging to a prince," from prince + -ly (2). Meaning "sumptuous, magnificent, befitting a prince" is from 1530s.
a princely sum
a princely bearing
princely manner
primus
prince
Prince Albert
Prince Charming
princeling
princely
princess
Princeton
principal
principality
principally
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