trajection in English dictionary trajection Meanings and definitions of "trajection" (archaic) The act of trajecting; a throwing or casting through or across; also, emission. (archaic) transposition noun (archaic) The act of trajecting; a throwing or casting through or across; also, emission. noun (archaic) transposition more Grammar and declension of trajection trajection ( plural trajections) trajection (plural trajections) more Sample sentences with "trajection" Declension Stem Try again Available translations Kurdish Kurmanji Tamil Authors