a.1.Having, or consisting of, three members.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
This idiom means "He is always the same." Another example is pi-satanas pi-satanas on pe "Satan is always the same." The author classifies the idiom as a trimembral nominal sentence (literally, "As for Satan, it is again Satan").