Webster's Online Dictionary
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Definition: 1st class

Part of Speech Definition
Noun 1. Mail that includes letters and postcards and packages sealed against inspection.[Wordnet].

Source: WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.

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Topics by Level of Interest: 1st class

Topics sorted by level of Interest Level (1=low, 600=high)     Topics sorted Alphabetically Level (1=low, 600=high)
Chief Petty Officer 1st Class 6     1st Class (album) 6
1st Class (album) 6     Chief Petty Officer 1st Class 6
Petty Officer 1st Class 3     Petty Officer 1st Class 3

Source: the editor, created by/for EVE to gauge likely levels of human interest in linguistically triggered topics (compiled across various sources, such as Wikipedia and specialty expression glosses).