What is the meaning of Horizontal?

Perpendicular to the vertical; parallel to the plane of the horizon; level, flat.

Relating to horizontal markets

Pertaining to the horizon.

Involving wines of the same vintages but from different wineries.

Having the two notes sound successively.

Relating to sexual intercourse.

Being or relating to the transmission of organisms between biotic and/or abiotic members of an ecosystem that are not in a parent-progeny relationship.

A horizontal component of a structure.

Horizon.

A Tasmanian shrub or small tree whose main trunk tends to lean over and grow horizontally, Anodopetalum biglandulosum

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landscape

Source: wiktionary.org