For reactions involving oxygen, the gain of oxygen implies the oxidation of the atom or molecule to which the oxygen is added (and the oxygen is reduced). In organic compounds, such as butane or ethanol, the loss of hydrogen implies oxidation of the molecule from which it is lost (and the hydrogen is reduced).
In Ethiopian Orthodoxy, fasting (tsome) lasts for 55 continuous days before Easter (Fasika), although the fast is divided into three separate periods: Tsome Hirkal, eight days commemorating an early Christian figure; Tsome Arba, forty days of Lent; and Tsome Himamat, seven days commemorating Holy Week.
Even after the Council of Nicaea the beginning start date of Lent was still questioned. In 601 Pope Gregory moved the beginning of Lent from the fourth Sunday of the year to Ash Wednesday, 46 days before Easter. This changed allowed for 40 days of fasting with six Sundays counted as feast days, for a total of 46 days for Lent.