Meaning: せっせんn. (Kanji=切線) tangent, line or curve that touches but does not intersect with another line or curve (Geometry)n. (Kanji=接戦) close combat, close contest, infighting, face-to-face fightingn. (Kanji=接線) tangent, line or curve that touches but does not intersect with another line or curve (Geometry)