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1. A construction plan. It is called a blueprint because it historically has been printed on blue paper with white lines.

2. In photography, a copy of a periodical printed before final editing in which images are shown on blue paper.

3. Informal, a plan.


A detailed set of plans used as a guide for construction.Because of the economies of a very inexpensive method of creating and copying such plans, they were formerly characterized by white lines on blue paper.

References in periodicals archive ?
Issue of safety in public transport system cannot be confined to Blueline buses.
Chief minister Sheila Dikshit once famously said she would rather walk than board a Blueline bus.
The decision is significant in the wake of the government's blanket ban on Blueline buses.
Blueline buses cause more accidents than other modes of transport.
The Blueline operators opposed the government stand and contended that there has been drastic decline in the number of accidents involving the buses.
IT'S NOT the end of the road for the killer Blueline buses in Delhi.
The Delhi transport department will not renew any Blueline permit from Tuesday.
A transport department official said the Blueline bus owners' lobby appeared to be putting pressure on the government to prevent the phase- out of the fleet.
The government apparently is buying the bus operators' claim that if Bluelines are taken off the roads from December 14, public transport in Delhi will take a major hit.
With the absence of Blueline buses, the DTC is already earning ` 27 per km from its previous earning of ` 18," Lovely said.
Until October 15 this year, the 6,000- strong DTC ( Delhi Transport Corporation) buses were involved in 37 fatal accidents, but Bluelines were involved in 65 such accidents with just one- third the fleet.
The process of phasing out the Bluelines has already been delayed because the bus owners had approached the Delhi High Court.