Noun second class has 3 senses

• second class(n = noun.state) Array - not the highest rank in a classification; Array
is a kind of rank

• second class(n = noun.attribute) Array - not the highest quality in a classification; Array
is a kind of inferiority, low quality

• second class(n = noun.artifact) cabin class, economy class - a class of accommodations on a ship or train or plane that are less expensive than first class accommodations; Array
is a kind of accommodation

Adverbial second class has 1 sense

• second class(r = adv.all) Array - by second class conveyance; "we traveled second class"

second class