The Japanese noun '軸 (じく)' primarily means 'axis' or 'shaft'. As 'axis', it refers to a central line around which something rotates or is symmetrically arranged, such as the Earth's axis「地球の軸」(ちきゅうのじく). As 'shaft', it refers to a long, cylindrical object, often used in machinery or tools, like the shaft of a screwdriver「ドライバーの軸」(ドライバーのじく). The word can also be used metaphorically to describe a central or pivotal element in a concept or system, such as the axis of an argument「議論の軸」(ぎろんのじく).