Hora means "the correct moment". Its goddesses are the three Horai, who do not betray or deceive, and are therefore rightly called truthful. They bring and bestow ripeness, they come and go in accordance with the firm law of the periodicities of nature and of life.
Kerényi defines the Horai as personifications of qualitative temporal rightness — the ripeness of the correct moment — guardians of Olympus whose truthfulness encodes the inviolable law of natural periodicity.
, The Gods of the Greeks, 1951thesis