modern language; contemporary language
Refers to a language in its current, living form, as opposed to classical or historical stages. Often used in linguistic contexts.
This dictionary includes many examples of modern language usage.
Specifically refers to the Japanese language as used since the Meiji period or post-WWII, in contrast to classical Japanese (古文/文語).
Reading classics in modern Japanese translation makes them easier to understand.
I tried translating this passage of classical literature into modern language.
This textbook is written in modern language, so it's easy to read.