What is the meaning of the Latin sentence "Lex posterior derogat legi priori"?

a later act repeals the binding force of an earlier act
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the superior law repeals a subordinate act
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law is not retroactive
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The law does not enforce impossible things
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Lex specialis, in legal theory and practice, is a doctrine relating to the interpretation of laws and can apply in both domestic and international law contexts.The situation ordinarily arises with regard to the construction of earlier-enacted specific legislation when more general legislation is later passed. However, then, the doctrine called "lex posterior derogat legi priori" may also apply, the younger law overriding the older law
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