How Do You Spell PROPULSORY?
Pronunciation: [pɹəpˈʌlsəɹˌi] (IPA) 
Correct spelling for the English word "Propulsory" is [pɹəpˈʌlsəɹˌi], [pɹəpˈʌlsəɹˌi], [p_ɹ_ə_p_ˈʌ_l_s_ə_ɹ_ˌi] (IPA phonetic alphabet).
Pronunciation: [pɹəpˈʌlsəɹˌi] (IPA)
Correct spelling for the English word "Propulsory" is [pɹəpˈʌlsəɹˌi], [pɹəpˈʌlsəɹˌi], [p_ɹ_ə_p_ˈʌ_l_s_ə_ɹ_ˌi] (IPA phonetic alphabet).
Having power to propel or drive forward.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
There is no word propulsory in the English language. It seems to be a misspelling or a non-standard word. If you meant to ask about the etymology of the word compulsory, that might be more appropriate. The word compulsory comes from the Latin word compellere, which means to force or to compel. It entered English in the late 16th century and originally meant obligatory or required by law.
