…one-pointedness of mind citt’ekaggatā and calm tranquillity samatha, further see: samatha - vipassanā.

…and insight see: samatha-vipassanā, are very often met with and explained in the Sutta, as well as in the Abhidhamma.

Tranquillity…

…of tranquillity meditation samatha - kammatthāna see. bhāvanā Often also the 4 immaterial spheres arūpāyatana are called absorptions…

…however, any absorption is suitable. For details, see: samatha - vipassanā - App..

…who has taken t. as his vehicle’:…

…three apply to both calm samatha and insight-meditation, while the fourth refers to pure insight praxis only. With attentive mind he breathes…