Angle of reflection, b. [53].

Animal electricity, b. [238].

Anïon, b. [298].

Annus, a. [113].

Anode, b. [298].

Anomaly, a. [139], [141].

Antarctic circle, a. [131].

Antichthon, a. [82].

Anticlinal line, b. [537].

Antipodes, a. [196].