Saturn square Lilith (orb 1.1°) creates concrete friction between the two planets. The orb is very tight; this describes a stable character pattern more than a passing reaction.
Here, Saturn in Sagittarius in House 7 brings discipline, constraint, endurance, and mastery into House 7 (relationship, confrontation, and the mirror of others), with Sagittarius style (expansion, travel, belief, and the search for meaning); Lilith in Pisces in House 9 brings pure ideal, absolute demand, fascination, and refusal of compromise into House 9 (vision, belief, study, and wider horizons), with Pisces style (imagination, faith, compassion, dream, and permeability).
Concrete friction: this aspect puts Saturn (discipline, constraint, endurance, and mastery) and Lilith (pure ideal, absolute demand, fascination, and refusal of compromise) into repeated friction: one can interrupt, inhibit, or provoke the other in concrete situations. Visible angle: Saturn near the Descendant (orb 5.7°) and Lilith near the Midheaven (orb 1.1°) touch angles; this aspect is easier to notice through direct relationships, partners, opponents, and the way others are met; also through social role, reputation, career, and public image. House 7 (relationship, confrontation, and the mirror of others) is in friction with House 9 (vision, belief, study, and wider horizons); this can create blockage, inhibition, overreaction, or repeated conflict between the two fields.