natural language na·tu·ral·language uncommon noun 1. a human written or spoken language used by a community; opposed to e.g. a computer language Synonymsnatural languagetongue Antonymsartificial language Related words Word family natural language processingnatural language processing applicationnatural language processor Broader terms language Narrower terms mother tonguetone languagecreoleAmerindEskimo-AleutSino-TibetanAustro-AsiaticAustronesian WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.