eighty-four

The word 'eighty-four' is a transparent compound numeral formed within the Germanic linguistic tradition. Its first element, 'eighty', descends from the Old English 'eahtatig', a base-ten system construction literally meaning "eight tens". The second element, 'four', originates from the Proto-Indo-European root kʷetwór-, which gave rise to the number four across many Indo-European languages. The modern compound simply and logically combines these two established number words in a sequential, additive manner to denote the quantity of eighty plus four, showcasing the analytic and compounding nature of English number formation beyond twenty.

Structure: eighty (80) + four (4) - eighty: From Old English eahtatig, a compound of eahta (eight) and -tig (group of ten). Its functional role is to denote the cardinal number eight tens. - four: From Old English fēower, from Proto-Germanic fedwōr, from Proto-Indo-European kʷetwóres. Its functional role is to denote the cardinal number 4.