computer
n.-
1 electronic device (n.) A1 Beginner Computingan electronic machine that you use for work, games, or the internet.
a programmable electronic device that processes, stores, and retrieves data.
ExampleI use my computer every day to send emails and watch videos.
ExampleModern computers are capable of processing billions of operations per second, enabling complex simulations and high-speed data analysis.
UsageUsually a countable noun; can be used as a modifier in phrases like 'computer programmer' or 'computer screen'.
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2 a person who calculates (n.) C2 Proficiency Archaic Formal Matha person whose job was to do long and difficult math problems before machines were invented.
a person employed to perform complex mathematical calculations manually.
ExampleIn the past, a computer was a person who spent all day doing math.
ExampleBefore the advent of digital technology, the observatory employed dozens of human computers to map the trajectories of the stars.
Teacher's tipThis sense is historical; learners will mostly encounter it in books or films about the history of science, such as 'Hidden Figures'.
From compute + -er. Doublet of cantore, counter, and kontor. First sense first appears c. 1613 in the works of the poet Richard Brathwait. Second sense first appears c. 1897 in the magazine Engineering.