Summary: The Latin root *loqu* and its variant *locut* mean "speak." These roots are the word origins of a fair number of English vocabulary words, including e[*loqu*]ent, [*loqu*]acious, e[*locut*]ion, and circum[*locut*]ion. The roots *loqu* and *locut* are easily recalled through the words soli[*loqu*]y, or a "talking" by oneself, and inter[*locut*]or, or a person with whom you are "talking" or conversing.
