First class
First class noun - Mail that includes letters and postcards and packages sealed against inspection.
World and first class are semantically related. in prime topic. In some cases you can use "World" instead an adjective phrase "First class".
World
World adjective - Involving the entire earth; not limited or provincial in scope.
First class and world are semantically related. Sometimes you can use "First class" instead an adjective "World".
Both terms in one sentence
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Because of this anyone who is an avatar of someone in the real world is treated as a first class citizen, and lives in the lap of luxury.
Source: Audience Participation - It had echoes and parallels to both Inception and X-men First Class, has a perfect world-building background and spot-on characterisation.
Source: Fanfic Recs / X-Men: First Class - Highlighted in X-Men: First Class and arguably even more so in X-Men: Apocalypse, since he's quite literally out to destroy the world.
Cite this Source
World and First class. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/first_class/world
First class & World. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/first_class/world>.
World or First class. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/first_class/world.
Google Ngram Viewer shows how "first class" and "world" have occurred on timeline