adviser

or ad·vi·sor (ăd-vī'zər)
n.

1. One that advises, such as a person or firm that offers official or professional advice to clients.
2. An educator who advises students in academic and personal matters.

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Both forms occur with equal frequency throughout the English-speaking world, despite impressions that -er is predominantly British English and -or American English. In the Old English (up to 1150)C, the -er form is roughly twice as common as the -or form across all the varieties of English, and so the traditional spelling still predominates. Advisor is probably influenced by the existence of advisory; but adviser is preferable:

The Service would never forgive me a mucky divorce, dear—not its legal adviser—John Le Carré, 1989

The goose...shuffled off to see if she could find some advisors—Jeanette Winterson, 1985.

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also advisor

noun

One who advises another, especially officially or professionally: consultant, counselor, mentor. Law counsel. See opinion.

A person appointed by a state, on the basis of his or her qualification, for the purpose of assisting its accredited representative in an investigation (ICAO).

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For a list of words related to adviser, see:

• Occupations and Job Titles
• Teachers and Students - adviser: teacher or school administrator who counsels students on academic or personal difficulties

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See words rhyming with "adviser."

Dansk (Danish)
n. - rådgiver, fagkonsulent

Nederlands (Dutch)
adviseur, begeleider (bij studie)

Français (French)
n. - conseiller

Deutsch (German)
n. - Ratgeber, Berater

Ελληνική (Greek)
n. - σύμβουλος, καθοδηγητής

Português (Portuguese)
n. - conselheiro (m), consultor (m), preceptor (m), educador (m)

Русский (Russian)
советник

Español (Spanish)
n. - consejero, asesor, tutor

Svenska (Swedish)
n. - rådgivare, konsult

中文（简体）(Chinese (Simplified))
顾问, 指导教授, 劝告者

中文（繁體）(Chinese (Traditional))
n. - 顧問, 指導教授, 勸告者

한국어 (Korean)
n. - 충고자, 의논 상대, 고문, 지도교사

日本語 (Japanese)
n. - 助言者, 相談役, 顧問, 指導教官

العربيه (Arabic)
‏(الاسم) مرشد, الناصح‏

עברית (Hebrew)
n. - ‮יועץ, מייעץ‬

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