It is not Spanish but Italian, where it means "distant, long"; here perhaps an error by lanthanum (chemical element), lontananza, hontana, . . .
It's an Italian language word. It means far, there, on the horizon, distant. It can refer to distant in space (far) or distant in time, long ago or within a long time, i.e. the past or the future (far away).
Italian LONTANO, far, far away