Definitions from Wiktionary ( )

▸ noun:  The visible horizontal line (in all directions) where the sky appears to meet the earth in the distance.
▸ noun:  (figuratively) The range or limit of one's knowledge, experience or interest; a boundary or threshold.
▸ noun:  The range or limit of any dimension in which one exists.
▸ noun:  (geology) A specific layer of soil, or stratum
▸ noun:  (archaeology, chiefly US) A cultural sub-period or level within a more encompassing time period.
▸ noun:  Any level line or surface.
▸ noun:  (computer chess) The point at which a computer chess algorithm stops searching for further moves.

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