Etymology
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designer (n.)

1640s, "one who schemes or plots;" agent noun from design (v.). In manufacturing or the fine arts, "one who makes an artistic design or a construction plan" is from 1660s. In fashion, as an adjective, "bearing the label of a famous clothing designer" (thus presumed to be expensive or prestigious), from 1966. Designer drug, one that mimics an illegal narcotic but has a different chemical composition so as to avoid legal restrictions, is attested by 1983.

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Definitions of designer

designer (n.)
a person who specializes in interior design;
Synonyms: interior designer
designer (n.)
someone who creates plans to be used in making something (such as buildings);
Synonyms: architect
designer (n.)
someone who specializes in graphic design;
Synonyms: graphic designer
designer (n.)
a person who devises plots or intrigues;
he is believed to be the principal designer of the terrorist bombing attack
Synonyms: intriguer
designer (n.)
someone who designs clothing;
Synonyms: couturier / fashion designer / clothes designer
From wordnet.princeton.edu