1. noun A line one person or one thing in width; single file. One of many expressions often considered offensive for making reference to Native American stereotypes or tropes. An Indian file of geese—such an unusual flight pattern for the bird—crossed overhead as we traversed the field.

2. adverb In such a line. The students lined up and walked Indian file into the auditorium.

1. noun A line one person or one thing in width. A single file of geese—such an unusual flight pattern for the bird—crossed overhead as we traversed the field. I arranged all the figurines in a single file.

2. adverb In such a line. The students lined up and walked single file into the auditorium. Cyclists are reminded to please ride single file on roads to avoid obstructing traffic.