Which term describes the high-voltage portion of the distribution circuit?

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The high-voltage portion of a distribution circuit is the primary winding of the transformer. In a typical setup, the distribution network delivers electricity at a high voltage to the transformer, where that high voltage is applied to the primary winding. The transformer then steps the voltage down for distribution on the secondary winding to feed downstream lines and eventually customers. The term secondary refers to the low-voltage side, not the high-voltage portion. Service describes the customer connection from the transformer to the building, and transformer windings can be either primary or secondary depending on which side you’re talking about, so it doesn’t specify the high-voltage portion.