-en / ə n/ BrE AmE suffix
[ Sense 1: Language: Old English ]
[ Sense 2: Language: Old English ; Origin: -nian ]
1 . [in adjectives] made of a particular material or substance:
a golden crown
wooden seats
2 . [in verbs] to make something have a particular quality:
darken (=make or become dark)
strengthen (=make or become stronger)