Iso

Part of speech: noun, adjective

Definitions

1. A prefix indicating equality or sameness in quantity, quality, or nature across various contexts
2. a term often used in scientific disciplines to denote uniformity in measurements or properties
3. a term in various fields that signifies identical or equivalent characteristics, commonly applied in mathematics and biology

Etymology: The prefix "iso-" comes from Greek "isos," meaning "equal" or "same," a word that also gave English "isosceles" (a triangle with two equal sides) and "isotope." It reached English through scientific coinages rather than everyday speech, so the prefix is a modern building block rather than a word with a long popular history. Its usefulness comes from how easily it attaches to other Greek-derived roots. Chemists and physicists used it to name things that share a property at equal levels: isotopes are atoms of the same element with the same number of protons but different numbers of neutrons, and isobars are nuclei with the same mass number. Mapmakers and scientists later used it in the same way, for lines or values that stay constant across a measured region. The prefix works as a combining form, so "iso-" is joined to a base to make a new term, and its meaning stays fixed: whatever follows is being described as equal, uniform or identical in some respect.

Synonyms: equal, identical, same, equivalent, uniform