(sports) A rule regarding play on a specific field, course, or court. / (idiomatic, usually in the plural) The basic rules or standards; whatever someone must know before proceeding.

A place or region where animals go to breed. / (figuratively) A place or institution seen as creating large numbers of a stated thing, type of person, etc.

Used other than figuratively or idiomatically: see feet, on, ground. / (usually with have or with) Used to indicate behavior or manner characteristic of a practical person

An area of water used for fishing (usually a sea area).

(law, real estate) Rent paid under a ground lease, usually long-term or in perpetuity, for a surface right or estate in land where the landowner (surface owner) and the owner of improvements (ground lessor) are separate; the improvements are effectively security for the payment of the rent.

scarce, or difficult to find.

plural of high ground

plural of out ground

plural of recreation ground

plural of grounding line