half-marathon

the word is a modern english compound, formed in the late 20th century with the rise of organized long-distance running events. the first element, 'half', derives from old english 'healf', of germanic origin, meaning one of two equal parts. the second element, 'marathon', entered english in the 1890s to denote the specific long race, named after the greek plain of marathon, site of a pivotal battle in 490 b.c. the legendary story of a messenger running from marathon to athens to announce victory provided the inspiration for the race length. thus, 'half-marathon' logically denotes a race exactly half the standard marathon distance, combining a native english quantifier with a historically charged proper noun to create a clear, measurable athletic category.

Structure: half (half) + marathon (marathon) half (old english, meaning 'half'); marathon (modern english, from the name of the battle at marathon, greece, used to denote a long-distance footrace).