- In popular language grass means a short, green, ground covering or lawn, usually, but not necessarily comprised of a "true grass" or grasses, called turf. See also pasture, grass (material).
- In botany, grass refers to plants of the family Poaceae. These are the true grasses.
- Plants that are not true grasses include:
- China grass or remie or rhea (Boehmeria nivea), a nettle grown for bast fibres, in the family Urticaceae
- Ditch grass or Wigeon grass (Ruppia maritima) in the family Ruppiaceae
- Fish grass (Cabomba caroliniana)
- Goosegrass (Galium aparine)
- Mondo grass or lily turf (Ophiopogon japonicus), an Asian ornamental ground cover
- Nutgrass, a common lawn pest (Cyperus rotundus) in the family Cyperaceae
- Pepper grasses (Lipidium spp.) in the family Brassicaceae
- Sawgrass, abundant in sub-tropical marshlands (Cladium spp.) in the family Cyperaceae
- Scurvy-grass (Cochlearia species) in the family Brassicaceae
- Scurvy-grass Sorrel (Oxalis enneaphylla) in the family Oxalidaceae
- Seagrasses, including Eel grass (Zostera spp.)
- "Sleeping grass" (Mimosa pudica) a legume (family Fabaceae) and lawn pest
- Xyridaceae, known as the yellow-eyed grass family
- Grass is slang for marijuana or for a criminal who informs on his accomplices.
- GRASS for "GRAphics Symbiosis System" is a computer programming language
- GRASS GIS (Geographic Resources Analysis Support System) is an Open source geographic information system.
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