\I`so*cli"nal\, Isoclinic \I`so*clin"ic\, a. [Iso- + Gr. ? to incline.] Of or pertaining to, or indicating, equality of inclination or dip; having equal inclination or dip. {Isoclinal lines} (Magnetism), lines on the earth's surface connecting places at which a dipping needle indicates the same inclination or dip.