The answer is once-over. Milady describes the technique directly: to perform a once-over shave, use a few more strokes while shaving across the grain in each area, which should ensure a complete and even shave with a single lathering.
The book reminds barbers to use a light hand throughout to avoid causing irritation. The second-time-over and close shave, by contrast, are described elsewhere as follow-up passes performed after the first pass — they involve a second application, not the single-lathering approach this question is asking about.
Milady Standard Barbering, 6th ed., Ch. 13 (Shaving and Facial-Hair Design), p. 349: "To perform a once-over shave, use a few more strokes while shaving across the grain in each shaving area. This practice should ensure a complete and even shave with a single lathering."
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