- controlled airspace
- controlled discharge
- controlled river
- contrude
- convection coefficient
- convection furnace
- convection section
- conveniently-placed
- convention
- conventional
- conventional signs
- convergence algorithm
- convergence circuit
- convergent bunder
- convergent lines
- convergent series
- converging power
- conversation
- conversational processing
- converse theorem
- conversion coefficient
- Conversion factor
- conversotional communication
- converter
- converter tilting
- convertible
- convex bow
- convex cutter
- convex mirror
- convex weld
- convexity
- convexo-plane
- conveying capacity
- conveying machinery
- conveyor screw
- convolute temperature
- convolutional
- convoy
- cool
- cool down
- cool gas
- cool vapour
- coolant
- coolant fan
- coolant system
- cooled
- cooled food
- cooled medium
- cooled water
- cooler section
- cooling air
- cooling apparatus
- cooling battery
- cooling box
- cooling channel
- cooling degree
- cooling fan
- cooling fixture
- cooling gas
- cooling installation
- cooling machine
- cooling medium
- cooling oil
- cooling period
- cooling power
- contracting state
- contraction crack
- contraction joint
- contraction scour
- contractive
- contractor
- contradiction
- contraprop
- contrariwise
- contrast level
- contrast ratio
- contravariant
- contribute
- contributive
- control accessories
- control action
- control arm
- control ball
- control bit
- control button
- control center
- control circuitry
- control code
- control damper
- control device
- control element
- control equipment
- control force
- control function
- control gird
- control hole
- control instruction
- control key
- control language
- control loop