mul·​ti·​task·​er | \ˈməl-tē-ˌta-skər, -ˌtī-\
plural multitaskers

Definition of multitasker 

: someone or something that performs multiple tasks : one that multitasks:

a : a person who can perform or manage many tasks at the same time The ultimate multitasker, he routinely had a half-dozen or more projects under contract at the same time, all of which would be seen to timely completion.— Mark S. Micale

b : something that has many functions or uses Skin is our largest organ, and it's a multitasker: It retains fluids while protecting us from bacteria and other foreign objects, it insulates, and it facilitates hair growth and perspiration.— Rebecca Skloot

First Known Use of multitasker

1982, in the meaning defined above

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The first known use of multitasker was in 1982

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