What does coprocessor mean?
A coprocessor is a secondary computer chip that works alongside a system's main processor to carry out specialized operations more efficiently. Rather than replacing the CPU, it offloads particular kinds of work—most famously floating-point arithmetic, but also graphics rendering, digital signal processing, or sensor management—so the overall system runs faster. The term became familiar in the personal computing era of the 1980s and early 1990s, when machines such as the IBM PC could be upgraded with an optional math coprocessor like the Intel 8087; software that exploited it ran dramatically quicker. Eventually, as chips grew more powerful, many coprocessor functions were absorbed directly into the main processor, yet the idea lives on in modern devices through dedicated units for graphics, machine learning, and motion sensing. The word carries a technical register and appears chiefly in computing literature, hardware documentation, and engineering discussion. Understanding it offers useful insight into how computers divide labor among chips.
nounA secondary processor inside a computer that performs specialized tasks—such as floating-point arithmetic or graphics processing—to supplement the work of the main CPU.
- Computing: a supplementary microprocessor designed to handle specific operations (such as floating-point arithmetic, graphics, or signal processing) on behalf of the main CPU.
"The math coprocessor offloaded floating-point calculations from the CPU, dramatically speeding up scientific software."
"The vintage PC shipped without a floating-point coprocessor, so spreadsheet recalculations crawled."
"Modern smartphones embed a dedicated motion coprocessor to track sensor data while the main CPU sleeps."
Standard regular plural; commonly used when describing systems with multiple auxiliary processors.
"Modern GPUs contain thousands of parallel coprocessors working simultaneously."
Before the Intel 80486 built the math coprocessor onto the main chip in 1989, computers that lacked a separate 8087 or 80387 chip simply couldn't run demanding spreadsheet and CAD programs at full speed — one missing chip could halve your PC's power.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of coprocessor
The word 'coprocessor' is formed from the prefix 'co-' (from Latin 'cum', meaning 'together') combined with 'processor', which derives ultimately from the Latin verb 'procedere', 'to advance or proceed', via the agent noun 'processor'. The compound arose in twentieth-century computing terminology to name a chip that processes data alongside the main CPU. Its formation follows the productive pattern of English 'co-' compounds such as 'co-worker' and 'co-pilot'.
How coprocessor is actually used
A technical term used mainly in computing, engineering, and electronics contexts; rarely encountered in general conversation. Historically associated with 1980s–90s PCs, though the concept persists in modern SoC design under names like 'neural engine' or 'sensor hub'.
Easily confused with coprocessor
A microprocessor is the main central processing unit of a computer, whereas a coprocessor is a supplementary chip that assists the main processor with specialized tasks.