x1 is a (Lojban) root word expressing relation x2 among argument roles x3, with affix(es) x4.
Gismu list, if physical object (= (loi) gimste); referring to the mental construct (e.g. propose adding a new gismu to the gismu list = gimpoi, gimselcmi, gimselste). See also cmavo, cmene, lujvo, smuni, sumti, tanru, valsi.