Etymology
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blueprint (n.)

also blue-print, 1882, from blue (adj.1) + print (n.). The process uses blue on white, or white on blue. Figurative sense of "detailed plan" is attested from 1926. As a verb by 1939.

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Definitions of blueprint
1
blueprint (n.)
something intended as a guide for making something else;
a blueprint for a house
Synonyms: design / pattern
blueprint (n.)
photographic print of plans or technical drawings etc.;
2
blueprint (v.)
make a blueprint of;
Synonyms: draft / draught
From wordnet.princeton.edu