A small number of people; a gathering or situation with few participants (e.g., a small class or meeting).
少人数のクラスは先生の目が行き届きやすい。
Small classes allow the teacher to pay closer attention to students.
このツアーは少人数で行われるため、静かで落ち着いています。
Because this tour runs with a small group, it's quiet and relaxed.
少人数なら予約なしでも入れることが多い。
If there are only a few people, you can often get in without a reservation.