Constituting number fifteen in sequence; the ordinal form of fifteen.
From 'fifteen' (Old English fīftēne, from fīf 'five' + tēne 'ten') plus ordinal suffix '-th.' Represents the Germanic counting system built on bases of five and ten.
The fifteenth century is often called the 'threshold of modernity' - it saw the printing press, Columbus's voyage, and the Renaissance flowering. Linguistically, it's when Middle English was transitioning to Early Modern English, making it a pivot point in language history.
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