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In Sutta MN 148 phassa is described. And in many other Suttas.
Chachakka Sutta: The Six Sextets
"'The six classes of contact should be known.' Thus was it said. In reference to what was it said? Dependent on the eye & forms there arises consciousness at the eye. The meeting of the three is contact. Dependent on the ear & sounds there arises consciousness at the ear. The meeting of the three is contact. Dependent on the nose & aromas there arises consciousness at the nose. The meeting of the three is contact. Dependent on the tongue & flavors there arises consciousness at the tongue. The meeting of the three is contact. Dependent on the body & tactile sensations there arises consciousness at the body. The meeting of the three is contact. Dependent on the intellect & ideas there arises consciousness at the intellect. The meeting of the three is contact. 'The six classes of contact should be known.' Thus was it said. And in reference to this was it said. This is the fourth sextet.
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Some places where it's defined or described:
Phassa is Pali, and Access to Insight references its being used in Pali suttas.
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As per my dictionaries:
Phassa (sanskr. sparça): contact, touch, tangibility, tactile sensation, a momentary union of the sense-object, sense-door, and sense-consciousness.
It's a standard term coming all the way back from the Pali Canon and used widely by Theravada and Abhidhamma.