Definify.com

Webster 1913 Edition

(gām′ĭng)

Noun.

The act or practice of playing games for stakes or wagers; gambling.

ppr.

Playing; sporting; playing for money.

Noun.

The act or art of playing any game in a context for a victory, or for a prize or stake.

The practice of using cards, dice, billiards and the like, according to certain rules, for winning money, &c.

gaming

gaming ‎(countable and uncountable, plural gamings)

The playing of a game or games, including but not limited to video games and games of chance.
- Philip Schaff
  […] the unprofitable plays, frivolous recreations, sportings, and gamings which are invented to pass away the precious time, and divert the mind from the witness of God […]
- 2013 June 28, Tom Vanderbilt, “The lose-lose logic of the machine zone”, in The Guardian Weekly, volume 189, number 3, page 29:
  The US gaming industry, in a pamphlet called Demystifying Slot Machines […], argues that "slot manufacturers need to build devices for a society with a decreasing attention span and an increasing demand for exciting, fast-paced entertainment, all in a marketplace overflowing with competing entertainment options".
Careful, strategic use of rules to achieve one's purposes, as one would use the rules of a game.