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.
Lent starts on Ash Wednesday, lasts 40 days not counting Sundays and ends on Holy Saturday, the day before Easter. There are 46 days because Sundays are not included during Lent. Some say that Sundays aren't counted in the 40 days of Lent, because every Sunday carries with it a part of the glow of Easter Sunday.