task

any piece of work that is undertaken or attempted; "he prepared for great undertakings"

a specific piece of work required to be done as a duty or for a specific fee; "estimates of the city's loss on that job ranged as high as a million dollars"; "the job of repairing the engine took several hours"; "the endless task of classifying the samples"; "the farmer's morning chores"

assign a task to; "I tasked him with looking after the children"

use to the limit; "you are taxing my patience"