Look up Layman in Wiktionary, the free dictionary.

The term layman originated from the use of the term laity, but over the centuries, changed definition to mean "a person who is a non-expert in a given field of knowledge". Wikipedia does not have an article with this exact name. ... Wiktionary is a Wikimedia Foundation project intended to be a free wiki dictionary (hence: Wiktionary) (including thesaurus and lexicon) in every language. ... In religious organizations, the laity comprises all lay persons collectively. ...

The concept of describing something in layman's terms has come into wide use in the English speaking world. To put something in layman's terms is to describe a complex or technical issue using words and terms that the average individual (someone without professional training in the subject area) can understand, so that they may comprehend the issue to some degree.

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