Quantum

noun (plural quanta); also adjective

/ˈkwɒntəm/

In computing, relating to a fundamentally new paradigm that exploits quantum-mechanical phenomena — superposition, entanglement, and interference — to process information using qubits rather than classical binary bits, enabling exponentially faster solutions for certain categories of problems.

✍️ Usage in a UPSC answer

Effective decentralisation hinges not on rhetoric but on the quantum of untied funds actually devolved to local bodies, for genuine self-governance withers when panchayats are handed responsibilities without a commensurate share of resources.

Synonyms

amountquantityshareportionmeasureallocation

Antonyms

wholetotalityentirety

🌱 Word Family

quanta (n plural), quantize (v), quantization (n), quantized (adj), quantum (adj)

🔡 Root

Latin quantum = how much (neuter of quantus = how great); applied to physics by Planck 1900; computing 1980s

📜 Etymology

From Latin quantum ("how much"), neuter of quantus ("how great"); first used in physics by Max Planck in 1900 to describe discrete energy packets; applied to computing from the 1980s following Richard Feynman's proposals.

🧠 Memory Hook

Quantum shares its root with "quantity" — both trace to Latin quantus, "how much"; a quantum is simply the "how-much", the measured amount or share of a thing.

📝 Seen in UPSC Question Papers

Prelims 2025 — Technology
Prelims 2025 — IT & Cyber
Prelims 2022 — IT & Cyber
Mains 2015 · GS3 · 12.5 marks — Environment

Real UPSC previous-year questions whose text uses “Quantum” — proof this word earns its place on your list.

🔬 Science & Technology 📖 Seen in: Emerging Technologies — AI, Quantum Co...

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