291. Prefixes SIN- and MEM-.
SIN- and MEM- are used as prefixes to translate the English -self. If the idea is reflexive, it is better to use sin-, otherwise mem-. Singardo = caution; sinmortigo = suicide; sinteno = attitude; memstara = independent; memvola = voluntary.
292. Prefix VIC-.
The prefix VIC- denotes the English vice-; vicprezidanto = a vice-president; vicadmiralo = a vice-admiral.
293. Suffix -ISM-.
The suffix -ISM- was officialized in 1914 with the rather wide meaning given it by international usage in most European languages: system, doctrine, school of thought, theory, party.
Thus: absolutismo = absolutism. Similarly, we have agnostik-, alkohol-, braman-, despot-, epikur-, Esperant-, fatal-, fetiĉ-, homaran-, katolik-, kvaker-, komun-, ideal-, liberal-, mistik-, presbiter-, protestant-, puritan-, radikal-, real-, respublik-, vegetar-ismo.
It does not follow that if from any Esperanto word ending in -ism this syllable is subtracted, the remainder is an Esperanto root. Thus, -ism is not a suffix in the roots atavism, feminism, optimism, pesimism, silogism, solecism, sofism, any more than ist, in, il, ul, an, are suffixes in the roots optimist, turist; doktrin, vazelin; bacil, asimil; okul, formul; banan, turban, sultan. See par. [52] (b).