Vavatthāna: 'determining', defining. In its application to insight meditation, this term occurred first in Pts.M. I, p. 53; but in a verbal form, as a past participle, already in M. 111: tyassa dhammā anupada-vavatthitā honti,these things the mental properties were determined by him i.e. Sāriputta successively; see: Abh. St., p. 54. In Vis.M XX, 130, it is said: 'The determining of the truth of suffering is effected with the determining of mind-and-body in the purification of view see: visuddhi III. The determining of the truth of origination is effected with the discerning of conditions in the purification by transcending doubt see: visuddhi IV. The determining of the truth of the path is effected by emphasis on the right path in the purification by knowledge and vision of what is path and not-path see: visuddhi. Thus the determining of the 3 truths suffering, origin, path has been first effected by means of mundane lokiya knowledge only.; - See sammasana, visuddhi.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.