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Definitions

well-defined

[wel-di-fahynd] / ˈwɛl dɪˈfaɪnd /
ADJECTIVE
clear
Synonyms
STRONGEST
clear-cut distinct explicit precise straightforward transparent unambiguous
WEAK
apparent audible comprehensible graspable intelligible legible lucent lucid obvious plain sharp spelled out unblurred understandable well-marked
Antonyms
STRONGEST
ambiguous fuzzy indefinite obscure questionable vague

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Spaces are well-defined and venerable terms in physics and math.

From The Wall Street Journal • Feb. 26, 2026

If Europe’s economic problem is well-defined, the political fix hasn’t been.

From The Wall Street Journal • Feb. 12, 2026

"These theories assume that one is describing something with well-defined velocities and energies," explains Diana Kirschbaum.

From Science Daily • Jan. 15, 2026

Bears worry Apple is falling behind its “Magnificent Seven” peers without a well-defined roadmap to compete.

From MarketWatch • Jan. 9, 2026

However, this can be misleading, because quantum mechanics tells us that the particles do not have any well-defined axis.

From "A Brief History of Time: And Other Essays" by Stephen Hawking

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.