Word of the Day

Lucubrate derives from the Latin verb lūcubrāre “to work at night” or, more specifically, “to work by candlelight/lamplight,” from the Proto-Indo-European root lewk- “light,” which is the source of many Latin-derived words related to light, clarity, and brightness. From the verb lūcēre “to shine,” we inherit lucid and translucent; from the verb lūstrāre “to make bright,” we have adapted luster and illustrate; and from the noun lūmen “light,” we have luminous and illuminate. This Proto-Indo-European root is also found in the English terms light and lea, another word for “meadow”; Latin lūna “moon”; and Ancient Greek leukós “white,” as in leukocyte, the technical term for a white blood cell. Lucubrate entered English in the early 1600s.

Indefatigable “incapable of being tired out” has changed little in spelling and meaning since its origin as the Latin adjective indēfatīgābilis “untiring” or, more literally, “not-tire out-able.” This adjective derives from the verb fatīgāre “to tire,” the source of English fatigue (via French), but its ultimate origin is unknown. The most compelling theory is that fatīgāre comes from a hypothesized adjective, fatis “gaping open” or “yawning,” found also in the verb fatīscere “to grow weak” or “to crack open.” Indefatigable entered English in the late 1500s.

Vicinage “a particular neighborhood or district” is a fusion of the Latin adjective vīcīnus “nearby” and the English suffix -age, which forms nouns from other parts of speech. Vīcīnus derives from the noun vīcus “village, hamlet,” which is the source of the suffixes -wich and -wick in English placenames, such as Greenwich and Brunswick, and comes from the Indo-European root weik- “clan” or “settlement.” This same root is the source of villa, from the Latin word for “country house,” and the Ancient Greek noun oikos “home,” which gives English ecology, economy, parochial, and parish.

Connubial “of marriage or wedlock” derives from Latin cōnūbiālis, from cōnūbium “wedding,” plus the adjective-forming suffix -ālis. Cōnūbium, in turn, is a compound of com- “together, with” and nūbere “to wed,” and nūbere (stem nupt-) is the source of marriage-related words such as nubile, nuptial, and prenup. Nūbere is of obscure origin, but one theory is that its original definition was “to cover oneself with a veil,” which would suggest a derivation from nūbēs “cloud.”

Moratorium “a suspension of activity” comes directly from Late Latin morātōrius “tending to delay,” a derivative of the verb morārī “to delay,” from the noun mora “delay, hindrance, pause.” The ending -ōrius “tending to” is also found as -orium or -ory in English terms for places in which a certain action occurs regularly, such as auditorium, a place where something is heard, and dormitory, a place for sleeping.