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a device or control that is very useful for a particular job
appliance
contraption
convenience
gadget
gismo
the faculty of contriving; inventive skill
the act of devising something
devisal
any improvised arrangement for temporary use
lash-up
an elaborate or deceitful scheme contrived to deceive or evade
dodge
stratagem
an artificial or unnatural or obviously contrived arrangement of details or parts etc.
a plot device or a literary technique that is used to resolve a difficult or complicated situation in an unexpected and somewhat unrealistic way