The planet Earth.
A circular military formation used in Ancient Rome, corresponding to the modern infantry square.
A spherical model of Earth or other planet.
A land snail of the genus Mesodon
A light bulb.
A woman's breast.
Any spherical (or nearly spherical) object.
To become spherical.
To make spherical.
The visible horizontal line (in all directions) where the sky appears to meet the earth in the distance.
A specific layer of soil, or stratum
The point at which a computer chess algorithm stops searching for further moves.
Any level line or surface.
The range or limit of one's knowledge, experience or interest; a boundary or threshold.
A cultural sub-period or level within a more encompassing time period.
The range or limit of any dimension in which one exists.