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ía is a suffix found in several Romance languages, especially Spanish and Portuguese, used to form nouns from stems. It originates from Latin -ia and is carried into many learned terms through Greek -ia as well. In general, -ía serves to create abstract nouns, names of disciplines, or terms related to a particular place, state, or activity.

In Spanish, many nouns ending in -ía denote fields of study or domains of knowledge, as well as abstract concepts. Examples include filosofía (philosophy), geografía (geography), biografía (biography), ideología (ideology), and teoría (theory). The suffix also appears in other kinds of nouns borrowed from Greek or Latin, especially in scientific or scholarly vocabulary, such as psicología (psychology).

The use of -ía varies across languages. In Portuguese, the same suffix pattern occurs in many nouns that name disciplines or concepts. In Italian and other Romance languages, -ia or -ía forms are common in similar ways, often reflecting the same Latin or Greek origins.

Because -ía is a productive and widely established suffix, a large portion of technical, academic, and cultural vocabulary in these languages ends with -ía. It is not a separate word but a grammatical element that helps categorize and systematize terms related to knowledge, state, or place within the language’s lexicon.

See also: -logía, -grafía, -ía as a suffix in Romance languages.