Tangible, a.
Etymology: [L. tangibilis, fr. tangere to touch: cf. F. tangible. See Tangent.]
1. Perceptible to the touch; tactile; palpable. Bacon.
2. Capable of being possessed or realized; readily apprehensible by the mind; real; substantial; evident. "A tangible blunder." Byron. Direct and tangible benefit to ourselves and others. Southey. -- Tan"gi*ble*ness, n. -- Tan"gi*bly, adv.
Shades of meaning
Fernald has no entry of its own for tangible; he lists it under evident, physical.
Where he writes about it:
Palpable and tangible express more emphatically the thought of manifest. — from evident