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tr.v. in·val·i·dat·ed, in·val·i·dat·ing, in·val·i·dates
To make invalid; nullify.

in·val′i·da′tion n.
in·val′i·da′tor n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.invalidator - an official who can invalidate or nullifyinvalidator - an official who can invalidate or nullify; "my bank check was voided and I wanted to know who the invalidator was"
functionary, official - a worker who holds or is invested with an office
References in periodicals archive ?
There are also other things a Muslim should learn such as the invalidators of prayer, its Sunnah acts, its recommended acts, etc.
Those standing in line at the elections waited for their turn to exercise their right to vote, while some members of the "Mobtiloon" ("Invalidators" or "Voiders") movement stood at a short distance from the committee center, urging people to invalidate their votes - so as for the next president to be aware that he does not enjoy the support of all Egyptians, that he is coming to the post with a meager majority, and that he must seek to prove to those who boycotted the elections, invalidated their votes or voted against him that they were wrong and that he will truly lay the foundations for building a modern state, after the havoc Egypt was subjected to for decades.