adj.

1. Constituting or belonging to the first, highest, or best group in a system of classification: a first-class hotel; first-class mail.
2. Of the foremost excellence or highest quality; first-rate: a first-class mind.

firstclass first' class' adv.

U.S. Postal Service designation for a class of mail that receives the fastest delivery (2 to 5 days across the United States) and costs the highest postage rate of the three classes of mail. First-Class mail includes personal correspondence, bills, and account statements. There are three subclasses of First-Class including postcards, letters, and sealed parcels as well as Priority Mail, with different postage rates applying to each. Any mailable material may be sent First-Class but non-bulk mail letters and invoices must mail First-Class according to USPS regulations. Invoices inserted into merchandise shipments must follow the regulations governing commingled mail (see commingle). First-Class mail meeting minimum volume requirements of 500 pieces may be presorted before being entered into the postal system to qualify for a presort discount rate. Undeliverable First-Class mail will be returned to the sender or forwarded to a new address without charge, except for First-Class postcards. Promotional mail is sometimes sent First-Class because it is more likely to be opened than Standard Mail. Because of the expense, First-Class is the exception rather than the rule in direct marketing.

adjective

1. Exceptionally good of its kind: ace, banner, blue-ribbon, brag, capital, champion, excellent, fine¹, first-rate, prime, quality, splendid, superb, superior, terrific, tiptop, top. Informal A-one, bully, dandy, great, swell, topflight, topnotch. Slang boss. Chiefly British tophole. See good/bad.
2. Of fine quality: choice, fine¹, prime, select, superior. See better/worse.

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Dansk (Danish)
adj. - førsteklasses

Nederlands (Dutch)
uitstekend, eerste klas

Français (French)
adj. - (Transp) de première classe, (Postes) tarif normal ou rapide, (GB, Univ) avec mention très bien, excellent, de premier ordre

Deutsch (German)
adj. - erstklassig

Ελληνική (Greek)
adj. - πρώτης τάξης, πρώτης κατηγόριας, (επιβάτης κ.λπ.) πρώτης θέσεως

Italiano (Italian)
di prima classe

Português (Portuguese)
adj. - excelente

Русский (Russian)
первоклассный, превосходный

Español (Spanish)
adj. - eminente, excelente, de primer orden, de primera calidad

Svenska (Swedish)
adj. - förstaklass-

中文（简体） (Chinese (Simplified))
最好的, 优秀的, 第一流的

中文（繁體） (Chinese (Traditional))
adj. - 最好的, 優秀的, 第一流的

한국어 (Korean)
adj. - 최고급의, 제1류의

日本語 (Japanese)
adj. - 第一流の, すばらしい, 一等の, 第一種の
adv. - 一等で, 第一種で, すばらしく

العربيه (Arabic)
‏درجه أولى ‏

עברית (Hebrew)
adj. - ‮מעולה, משובח, מהדרגה הראשונה‬

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