Correct spelling for the English word "gradationed" is [ɡɹadˈe͡ɪʃənd], [ɡɹadˈeɪʃənd], [ɡ_ɹ_a_d_ˈeɪ_ʃ_ə_n_d] (IPA phonetic alphabet).
Formed by gradation.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "gradationed" does not have an established etymology as it appears to be a non-standard or non-existent term. "Gradation" itself, however, comes from the Latin word "gradus", meaning "step" or "degree". In English, "gradatio" was used in the 14th century to refer to a step or stage in a process or sequence. Over time, it evolved into "gradation", which now primarily refers to a systematic progression or arrangement in stages or degrees.