Meaning

noun a British peer ranking below a marquess and above a viscount

originFrom Middle English erl, erle, from Old English eorl, from Proto-West Germanic *erl, from Proto-Germanic *erlaz (compare Old Saxon erl, Old Norse jarl), from Proto-Germanic *erōną, *arōną (compare Old Norse jara (“fight, battle”)). Doublet of eorl and jarl. Unrelated to ealdorman (“alderman”).

Etymology from Wiktionary, CC BY-SA 3.0