Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Previous word: invalid
Next word: invaluable
Definition of: invalidate
(in·val′ə·dāt) v.t. ·dat·ed, ·dat·ing
To weaken or destroy the force or validity of; render invalid; annul. [<INVALID2 + -ATE1]
—in·val′i·da′tion noun
—in·val′i·da′tor noun
Comment about this word, ask questions, or add new information about this topic: