five-inning

The compound "five-inning" is a modern American English formation specific to the sport of baseball. Its first element, "five," traces back to the ancient Proto-Indo-European root pénkʷe, a stable numeral that evolved directly into the English word. The second element, "inning," originates from the Old English noun-forming suffix -ung attached to the verb innian, meaning "to get in, to put in," reflecting the concept of a team taking its turn "in" to bat. In baseball terminology, an "inning" constitutes a full cycle of play. Thus, "five-inning" logically denotes a game shortened to precisely five such cycles, a concept necessitated by the sport's specific rules regarding game duration and completion.

Structure: five (number) + inning (baseball period) - five: From Old English fīf, from Proto-Germanic fimf, from Proto-Indo-European pénkʷe. Functions as a numerical quantifier. - inning: From the verb inn (to get in, to house) + the nominal suffix -ing, from Old English -ung. Refers to a turn or period of play in baseball where both teams have a chance to bat.