- coupling path
- course
- cover slides
- coverage probability
- corrupt output
- cost decrease
- cost function
- cost-benefit
- coterminal angles
- count field
- counter circuit
- counter voltage
- counterpart funds
- counting circuits
- counting rate
- coupled antenna
- coupling network
- coverage overlap
- coverage presentation
- coverslip
- cradle switch
- crash course
- credentials
- Credit account
- credit balance
- credit note
- critical failure
- critical item
- critical resources
- criticality
- cross antenna
- crude structure
- cryopump
- crystal detector
- crystal state
- cross rate
- cross software
- cross-strap
- crossbar distributor
- crossed field
- CRT display
- crude rate
- cruncher
- cryptography
- crystal calibrator
- crystal clock
- crystal laser
- crystal memory
- crystal resonator
- cubical antenna
- cumulation
- curing
- current amplifier
- Current account
- current coil
- current contributions
- current device
- current distribution
- current drain
- current drift
- current drive
- current library
- current line
- current loop
- current mode
- current modulation
- current page
- current pointer
- current position
- current price
- current saturation
- current standard
- current state
- current-fed
- cursor key
- curtain
- curtain antenna
- curve generator
- curvilinear flow
- critical range
- cross correlation
- cross coupling
- cross interference
- cross modulation
- cross point
- cross simulator
- cross talk
- crossbar exchange
- crossed dipoles
- crossover area
- crosstalk interference
- custom LSI
- customer meter
- cutback
- cutoff wavelength
- cutter
- cutter fuse
- cryptographic session
- crystal holder
- crystal phase