What term defines the delivery of fuel to the cylinder at the exact point it's needed?

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Timing is the moment fuel is delivered during the engine cycle. Delivering fuel at the right crank angle ensures it mixes with air and burns at the optimal point, typically as the piston approaches or reaches compression, so power, efficiency, and emissions improve. If the timing is off, the fuel may burn too early or too late, reducing performance and causing knock or wasted fuel. Fuel injection describes how the fuel is introduced, not exactly when it happens. Synchronization is about coordinating events, but the specific term for when to inject it within the cycle is timing. Duration refers to how long the fuel is delivered, not the precise moment it occurs.