0 the action of stopping a document, ticket, law, etc. from being legally or officially acceptable: --
Premature disclosure of the test sites might lead to invalidation of the experiment.
Their terrible behaviour has led to the invalidation of any argument they make.
This finding constitutes the invalidation of many traditional approaches.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Vi kan slutföra det steg för steg hur lång vägen än är och den kan inte slutföras hur kort vägen än är om du inte ens markerar ditt fotavtryck.