twenty-eighth
Meaning
Constituting number twenty-eight in a sequence; 28th.
The person or thing that is number twenty-eight in a sequence.
One of twenty-eight equal parts of something.
Structure
Usage
She celebrated her twenty-eighth birthday with a quiet dinner.
The amendment is the twenty-eighth to be ratified under the current constitution.
He finished in twenty-eighth place in the marathon.
Etymology
The word 'twenty-eighth' is a modern English compound ordinal number, systematically built from its cardinal components. Its first element, 'twenty', originates from the Old English 'twēntig', literally meaning "two tens" or "a score", reflecting the ancient Germanic base-20 counting system. The second element, 'eighth', derives from Old English 'eahtoþa', formed by adding the ordinal suffix '-th' to the cardinal number 'eight', which has a stable Proto-Indo-European root oḱtṓw. The compound's logic is purely arithmetic, combining the concept of a set of twenty with the ordinal position of eight within the next set, to sequentially denote the position following the twenty-seventh. This transparent, additive method of forming higher ordinals is characteristic of the analytic nature of Modern English numeral grammar.
Analysis
twenty: From Old English 'twēntig', meaning "group of twenty". A compound of 'twēn-' (variant of 'twegen', two) + '-tig' (group of ten). eighth: From Old English 'eahtoþa', the ordinal form of 'eahta' (eight), with the suffix '-th' denoting ordinal number.