The word 'stratagem' has a purely military origin, tracing back to the Greek stratēgēma, meaning "the act of a general" or "a military maneuver." This was formed from stratēgos (general, literally "army-leader"), itself a compound of stratós (an army, originally meaning "that which is spread out") and agein (to lead). The concept evolved from the literal, physical deployment of troops on a battlefield to encompass any cleverly devised plan intended to gain an advantage, reflecting the abstract application of military cunning to general strategy and deception.

Structure: strata (spread, army) + gem (result, plan) - strata: From Greek stratós (an army, something spread out). In this word, it functions as the base, conveying the sense of military or strategic deployment. - gem: From Greek -agema (a result, an act), derived from the verb agein (to lead, to drive). In this word, it functions as a noun-forming suffix indicating the product or result of an action.