circuitrynoun/ˈsɜːkɪtɹi/

• 1

  A specific system of electrical circuits in a particular device; (uncountable) the design of such a system.

  • Telemetering transmitter removed from its pressurized container. The circuitry for each of the 23 channels can be quickly unplugged for servicing.
  • After jettison of nose cap, all the detector circuitry became exposed to the radiation environment.
• 2

  Electrical (or, by extension, other) circuits considered as a group.

  • In the microelectronics area, research and development efforts will concentrate on thin film circuitry, packaging and solid state electronics (work with transistors and the like). [...] The savings in weight over old-fashioned circuitry are important when the cost of items in orbit is figured at $1,000 per pound.
  • The source of that passion [according to René Descartes] is "animal spirits," a circuitry of mechanical energy—blood circulation, heartbeat, muscle tension—whose purpose is not to inform but to protect the body from harm. Although the circuitry operates automatically in animals, in men bodily energies also register on the soul so as to "incite the soul to correct and contribute to the actions which may serve to maintain the body."
• 3

  The brain's neural network.

  • Since [Santiago Ramón y] Cajal's neural circuitry did not include inhibitory cells, he believed that short-axoned cells were important in maintaining a continuous and persistent activity in neural centers.
  • Some argue that the human brain contains structures or circuitry not found in the brains of other animals. [...] Others emphasize the massive increase in human brain size and posit that human behavior is an emergent phenomenon which reflects quantitative increases in neural processing capacity.