To form by combining materials or parts; construct. To order, finance, or supervise the construction of: The administration built several new housing projects. To develop or give form to according to a plan or process; create: build a nation; built a successful business out of their corner grocery store. To increase or strengthen by adding gradually to: money building interest in a savings account; build support for a political candidate. To establish a basis for; found or ground: build an argument on fact. To make something by combining materials or parts. To engage in the construction or design of buildings: "Each of the three architects built in a different style\u201d ( Dwight Macdonald). To develop in magnitude or extent: clouds building on the horizon. To progress toward a maximum, as of intensity: suspense building from the opening scene to the climax. The physical makeup of a person or thing; physique: an athletic build. Computer Science Any of various versions of a software product as it is being developed for release to users. in To construct or include as an integral part of: a wall with shelving that was built in; build stability into the economy. on To use as a basis or foundation: We must build on our recent success. build up To develop or increase in stages or by degrees: built up the business; building up my endurance for the marathon. build up To accumulate or collect: sediment building up on the ocean floor. build up To bolster: build up the product with a massive ad campaign; built up my hopes after the interview. build up To fill up (an area) with buildings. build on sand To provide with an unstable foundation: Having bought only high-risk stocks, my portfolio was built on sand.