We found 2 dictionaries that define the word valid invalid:

Art (1 matching dictionary)

1. valid / invalid: Dictionary of Philosophical Terms and Names

Science (1 matching dictionary)

2. FOLDOP - Free On Line Dictionary Of Philosophy (No longer online)

▸ Words similar to valid invalid ▸ Usage examples for valid invalid ▸ Idioms related to valid invalid ▸ Wikipedia articles (New!) ▸ Words that often appear near valid invalid ▸ Rhymes of valid invalid ▸ Invented words related to valid invalid