For instance, many structural engineers rely on laboratory work, and engineering tests that they hire others to perform. These additional fees can drive the cost of any project up, but even more importantly, they can derail a program that was originally on schedule.
Word forms: plural gaps. 1. countable noun. A gap is a space between two things or a hole in the middle of something solid. He pulled the thick curtains together, leaving just a narrow gap. ...the wind tearing through gaps in the window frames.
Air gap (plumbing) An air gap, as it relates to the plumbing trade, is the unobstructed vertical space between the water outlet and the flood level of a fixture. A simple example is the space between a wall mounted faucet and the sink rim (this space is the air gap). Water can easily flow from the faucet into the sink, but there is no way that water can flow from the sink into the faucet without modifying the system.