Sentence:  In the microelectronics area, research and development efforts will concentrate on thin film <WSD>circuitry</WSD>, packaging and solid state electronics (work with transistors and the like). [...] The savings in weight over old-fashioned <WSD>circuitry</WSD> are important when the cost of items in orbit is figured at $1,000 per pound. 
Meaning of the word marked with <WSD> tags:  Electrical (or, "by extension", other) circuits considered as a group.