horizontal

1. (marketing) Relating to horizontal markets

2. (archaic) Pertaining to the horizon.Examples: "As when the Sun new ris'n / Looks through the Horizontal misty Air"archaic

3. (wine) Involving wines of the same vintages but from different wineries.

4. (music, of an interval) Having the two notes sound successively.Synonyms: linear, melodicAntonyms: vertical

5. (sex, euphemistic) Relating to sexual intercourse.Examples: "horizontal tango"; "Comparing a man who inspires you intellectually and makes you laugh with a guy who fulfils all your horizontal desires means you’re not comparing like with like."euphemistic

6. (biology) 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.Examples: "Infectious agents may spread by horizontal transmission."