Clergyman and professional are antonyms of layman.
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The opposite (antonym) of opposite is same.
opposite of opposite to opposite from
To go, and study full-time, as in "cloistered," or more commonly to live on campus.
If the opposite is meant to be the additive opposite and not the multiplicative opposite, then their sum is zero. The reason is that is what defines an additive opposite!
The opposite of "laymen's terms" would probably be "technical terms."
Isaac Layman has written: 'Isaac Layman--paradise' -- subject(s): Exhibitions
A. Layman has written: 'Saul Of Tarsus'
George Layman died in 1922.
George Layman was born in 1838.
Chase Layman is 6' 2".
Alfred Layman was born in 1858.
Alfred Layman died in 1940.
Layman can be used as a gender neutral, but if that makes you uncomfortable, try layperson. The plural of layman is laity.
John Layman was born on 1969-08-02.
Jason Layman was born on 1973-07-29.
Irish Catholic Layman has written: 'Letters of an Irish Catholic layman' -- subject(s): Accessible book