To schedule and execute multiple tasks (program) simultaneously; control being passed from one to the other using interrupts.(verb)
To handle multiple tasks at once.(verb)
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Use "multitask" in a sentence
"I'm not sure of the importance of any of the questions except numbers 4 18 minus the word multitask and number 20."
"But having downloaded the app just now, I can confirm that it is enabled to "multitask" - meaning you can quickly switch into and out of the app and into other background enabled apps."
"I force myself to just write without trying to multitask which is a bad habit at times, picked up that one in college."