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Kathisma
A section of the Psalter — the Psalter is divided into twenty kathismata for liturgical reading; the full Psalter read weekly.
A kathisma (from kathizo, to sit — one may sit during its reading) is one of the twenty sections into which the Orthodox Psalter is divided for liturgical use. The full Psalter is read through once each week during Orthros in ordinary time, and twice each week during Great Lent. The kathismata are read between the canon odes at Orthros.