| Noun | 1. | second class - not the highest rank in a classification |
| 2. | second class - not the highest rank in a classification | |
| 3. | second class - accommodations on a ship or train or plane that are less expensive than first class accommodations Synonyms: Cabin class | |
| Adv. | 1. | second class - by second class conveyance; "we traveled second class" |