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WIKTIONARY VIA KAIKKI / WIKTEXTRACT

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35,981 English word records · 45,491 etymology sections in this online subset

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1 source section across 1 headword matching “focus”. These are separate from the reviewed results below.

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focusEnglish (en) · Unnumbered etymologySource text

Borrowed from Latin focus (“hearth, fireplace”); see there for more. Related to fuel. Kepler introduced the term into mathematics and the sciences in describing elliptical orbits of planets (quote from Nicholas Mee): "One of the interesting properties of an ellipse is that if there were a light bulb at one focus, then all the light that it emits would reflect off the ellipse and converge at the other focus. This is why Kepler originally used the name focus for these points."

Original Wiktionary entry and references ↗

From Wiktionary contributors; extracted by Tatu Ylonen / Wiktextract / Kaikki.org. Extraction source · CC-BY-SA-4.0. Selected source text is reformatted for display; language and section identity are retained.

Source dump: 2026-10-01 · Extraction: 2026-10-30. These dates identify a dump snapshot, not an individual page revision.

Snapshot checksums and coverage
SOURCE SHA-256
5ff2c072f8099f2d2ce484bd6957bf179f046d2ad37bc36555edf8bb84cb5291
CORPUS SHA-256
c4c2a77325141846709230e11c2959332acd630d53e52905b72d36211251b081
IMPORT RUN
73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
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Lewis’s Elementary Latin Dictionary

1890 American Book Company edition; pinned Perseus XML digitization
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06

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