Fractions
In the everyday speech of ordinary people, the use of half long predated the other fractions. This is the earliest entry in the Oxford English Dictionary, from the year 835:
Charter in Old Eng. Texts 447, & him man selle an half swulung an ciollan dene.
The earliest reference to third as a fraction (as opposed to an ordinal number) is from half a millennium later: 1384.