In
In adverb - At, within, or to a short distance or time.
Within doors and in are semantically related. In some cases you can use "Within doors" instead an adverb "In".
Within doors
In and within doors are semantically related. You can use "In" instead an adverb phrase "Within doors".
Cite this Source
Within doors and In. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/in/within_doors
In & Within doors. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/in/within_doors>.
Within doors or In. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/in/within_doors.
Google Ngram Viewer shows how "in" and "within doors" have occurred on timeline