The Collaborative International Dictionary of English v.0.48:
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.
His easy bow, his good stories, his style of dancing
and playing tennis, . . . were familiar to all London.
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
WordNet (r) 3.0 (2006):
n 1: the court on which tennis is played