1st class
- noun
Examples
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The captain says that they travel 1st class, but nobody knows his language.
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I always choose 1st class for mailing important documents to ensure they arrive quickly.
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She sent the birthday card via 1st class mail, so it would get there on time.
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For urgent packages, I recommend using 1st class service at the post office.
Synonyms
A mail service that gives letters and small packages faster delivery
A fast mail service for letters and small packages that is delivered before other mail
A fast mail service for letters and postcards that gets priority delivery
How Fast
Surface Forms
Morphology
1st + class
The meaning is directly composed from '1st' (first/top) + 'class' (category), so a B1 learner who knows those words can infer it denotes the highest/prioritized category of mail. The numeric abbreviation '1st' is transparent and the construction (first + class = top category) is cross-linguistically common, making the expression immediately comprehensible.
Etymology
1St class comes from travel and old mail systems where first meant the top group and class meant a level of service, like the best seats on a train or ship. Mail marked 1st class was treated like those top passengers' things and moved faster, so today it means post sent with 'quick service'.