Noun

(en noun)

A person with extensive knowledge or ability in a given subject.

* If an expert''' says it can't be done, get another '''expert . -

* {{quote-magazine, date=2013-07-20, volume=408, issue=8845, magazine=(The Economist)

, title= Welcome to the plastisphere , passage=Plastics are energy-rich substances, which is why many of them burn so readily. Any organism that could unlock and use that energy would do well in the Anthropocene. Terrestrial bacteria and fungi which can manage this trick are already familiar to experts in the field.}}

(chess) A player ranking just below master.

Noun

(en noun)

The act of excepting or excluding; exclusion; restriction by taking out something which would otherwise be included, as in a class, statement, rule.

That which is excepted or taken out from others; a person, thing, or case, specified as distinct, or not included; as, almost every general rule has its exceptions.

(legal) An objection, on legal grounds; also, as in conveyancing, a clause by which the grantor excepts or reserves something before the right is transferred.

(senseid)An objection; cavil; dissent; disapprobation; offense; cause of offense; — usually followed by to or against.

(computing) An interruption in normal processing, especially as caused by an error condition.