"Doxology" passed into English from Medieval Latin "doxologia," which in turn comes from the Greek term "doxa," meaning "opinion" or "glory," and the suffix "-logia," which refers to oral or written expression. It's logical enough, therefore, that "doxology" has referred to an oral expression of praise and glorification since it first appeared in English around 1645. The word ultimately derives from the Greek verb "dokein," meaning "to seem" or "to seem good." Two cousins of "doxology" via "dokein" are "dogma" and "paradox." More distant relatives include "decent" and "synecdoche." The Gloria in Excelsis and the Gloria Patri are two of the best-known and most often sung doxologies in contemporary Christianity.