Japanese edit

For pronunciation and definitions of とうとう – see the following entries.
滔滔
[adjective] torrential (of flowing water)
[adjective] voluble (of speech)
[adjective] flowing strongly in one direction (of a matter of the times)
Alternative spelling
滔々
等々
[adverb] et cetera, etc.; and so on
[adverb] at last, finally
Alternative spellings
等等, などなど
到頭
[adverb] finally; at last; reaching a head
(This term, とうとう, is the hiragana spelling of the above terms.)