gravamen

Gravamen is not a word you hear every day, but it does show up occasionally in modern-day publications. It comes from the Latin verb gravare, meaning "to burden," and ultimately from the Latin adjective gravis, meaning "heavy." Fittingly, gravamen refers to the part of a grievance or complaint that gives it weight or substance. In legal contexts, gravamen is used, synonymously with gist, to refer to the grounds on which a legal action is sustainable. Gravis has given English several other weighty words, including gravity, grieve, and the adjective grave, meaning "important" or "serious."