This is the 10766th most frequent Polish word.
dwudziestych
"Dwudziestych" means "twentieth" (genitive plural form) in English.
Refers to the years in the 20s of a given century (dative plural form).
Lata dwudzieste były czasem dużych przemian.
The 1920s were a time of great changes.
Describes something related to the 20th years of a century (possessive plural form).
Odwiedziliśmy muzeum mody z dwudziestych lat.
We visited a fashion museum from the twenties.
Refers to the period of the 1920s (genitive plural form defining period).