'Lawn tennis' definitions:

Definition of 'lawn tennis'

noun

A game played with rackets by two or four players who hit a ball back and forth over a net that divides the court [syn: tennis, lawn tennis]

From: GCIDE

Tennis \Ten"nis\, n. [OE. tennes, tenies, tenyse; of uncertain origin, perhaps fr. F. tenez hold or take it, fr. tenir to hold (see Tenable).] A play in which a ball is driven to and fro, or kept in motion by striking it with a racket or with the open hand. --Shak. [1913 Webster]
His easy bow, his good stories, his style of dancing and playing tennis, . . . were familiar to all London. --Macaulay. [1913 Webster]
Court tennis, the old game of tennis as played within walled courts of peculiar construction; -- distinguished from lawn tennis.
Lawn tennis. See under Lawn, n.
Tennis court, a place or court for playing the game of tennis. --Shak. [1913 Webster]

From: GCIDE

Lawn \Lawn\ (l[add]n), n. [OE. laund, launde, F. lande heath, moor; of Celtic origin; cf. W. llan an open, clear place, llawnt a smooth rising hill, lawn, Armor. lann or lan territory, country, lann a prickly plant, pl. lannou heath, moor.]
1. An open space between woods. --Milton. [1913 Webster]
"Orchard lawns and bowery hollows." --Tennyson. [1913 Webster]
2. Ground (generally in front of or around a house) covered with grass kept closely mown. [1913 Webster]
Lawn mower, a machine for clipping the short grass of lawns.
Lawn tennis, a variety of the game of tennis, played in the open air, sometimes upon a lawn, instead of in a tennis court. See Tennis. [1913 Webster]