diversion (n.)

early 15c., diversioun, "process of diverting," from Medieval Latin diversionem (nominative diversio), noun of action from past-participle stem of Latin divertere (see divert).

Meaning "act of turning aside from a course of action" is from c. 1600; that of "act of diverting (something) from its due or ordinary course" is from 1620s. Military meaning "act of drawing the attention and force of the enemy from the point where the principal attack is to be made" is from 1640s.

Sense of "amusement, entertainment" is attested by 1640s, on the notion of "that which diverts the mind." Hence, divertimento (1823), from the Italian form; originally "a musical composition designed primarily for entertainment."

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Definitions of diversion from WordNet

diversion (n.)
an activity that diverts or amuses or stimulates;
scuba diving is provided as a diversion for tourists
Synonyms: recreation
diversion (n.)
a turning aside (of your course or attention or concern);
a diversion from the main highway
Synonyms: deviation / digression / deflection / deflexion / divagation
diversion (n.)
an attack calculated to draw enemy defense away from the point of the principal attack;
Synonyms: diversionary attack