From WordNet (r) 3.0 (2006) [wn]:
gymnastics
n 1: a sport that involves exercises intended to display
strength and balance and agility [syn: gymnastics,
gymnastic exercise]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
gymnastics \gym*nas"tics\ (j[i^]m*n[a^]s"t[i^]ks), n.
1. Athletic or disciplinary exercises; the art of performing
gymnastic exercises.
[1913 Webster]
2. Disciplinary exercises for the intellect or character.
[1913 Webster]
3. [fig.] Feats demonstrating a quick mental agility; as,
mental gymnastics, verbal gymnastics.
[PJC] Gymnic