Isoclinal \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.

Source: Webster's Revised Unabridged Dictionary (1913)