First class
First class noun - Mail that includes letters and postcards and packages sealed against inspection.
In keeping and first class are semantically related. In some cases you can use "In keeping" instead an adjective phrase "First class".
In keeping
First class and in keeping are semantically related. Sometimes you can use "First class" instead an adjective phrase "In keeping".
Both terms in one sentence
- Given that her entire first class of pupils was murdered, that's not a shock, and it's been strongly insinuated several times that there are no lengths she won't go to in keeping her current "kids" safe.
Source: Mama Bear / Comic Books
Cite this Source
In keeping and First class. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/first_class/in_keeping
First class & In keeping. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/first_class/in_keeping>.
In keeping or First class. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/first_class/in_keeping.
Google Ngram Viewer shows how "first class" and "in keeping" have occurred on timeline