A variant spelling of acharon (H314/H314), the adjective meaning last, latter, hinder, or western. In Hebrew geography, west was 'behind' (since one faced east toward the sunrise), making this word serve both temporal and spatial meanings.
The dual use of acharon for both 'last' and 'western' reflects the Hebrew practice of orienting by the sunrise — east is 'before,' west is 'behind.' This word undergirds the great eschatological vision of the 'latter days' (acharit) when God will gather His scattered people from east, west, north, and south. The 'western sea' (Mediterranean) and the 'latter days' share the same root — both point to what lies beyond, what is yet to come, what God has prepared. In Christ, the 'last days' have arrived (Hebrews 1:2), and He who is the Last holds the west and the future in His hands.