
gewählt
elected
Describes a person or thing that has been chosen for an office or function through a vote or election.
Der neu gewählte Bürgermeister wird nächste Woche sein Amt antreten.
The newly elected mayor will take office next week.
elected / refined
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elected
Describes a person or thing that has been chosen for an office or function through a vote or election.
Der neu gewählte Bürgermeister wird nächste Woche sein Amt antreten.
The newly elected mayor will take office next week.

refined
Describes a way of speaking, language, or behavior that is very polished, cultivated, and formal.
Er benutzte eine sehr gewählte Sprache, um seine Argumente vorzutragen.
He used very refined language to present his arguments.
'Gewählt' is the past participle of the verb 'wählen' (to choose / to vote). It is used as an adjective, and its meanings derive from 'wählen' in the sense of 'aussuchen' (to choose) or 'per Abstimmung bestimmen' (to determine by vote).
Sie hat ihre Worte mit Bedacht gewählt.
She chose her words carefully.
The context makes the meaning clear: If 'gewählt' refers to a person in office (e.g., president, representative), it means 'chosen by election'. If it refers to language, words, or behavior, it means 'cultivated' or 'polished'.
Der gewählte Vertreter sprach mit dem Volk.
The elected representative spoke to the people.
In the meaning 'cultivated', 'gewählt' (refined) is often combined with nouns that describe communication or behavior. Typical phrases are 'gewählte Sprache' (refined language), 'gewählte Worte' (carefully chosen/refined words), or 'gewählte Ausdrucksweise' (refined way of expressing oneself).
Für das offizielle Dokument ist eine gewählte Ausdrucksweise erforderlich.
A refined style of expression is required for the official document.
The meaning 'kultiviert' (cultivated) or 'gepflegt' (polished) belongs to a rather formal and educated style of language. In this context, the word itself already sounds 'gewählt' (refined).
Seine Rede war von einer gewählten Wortwahl geprägt.
His speech was characterized by a refined choice of words.
selected
Gewählt and ausgewählt can both describe a particularly polished way of speaking. Gewählt is the usual term for cultivated, formal language; ausgewählt highlights a particularly refined or deliberately chosen effect. For general style, gewählt is usually the more natural choice.

Die Rednerin drückte ihre Kritik in gewählten Worten aus.
The speaker expressed her criticism in refined language.
Die Rednerin begrüßte die Gäste mit ausgewählten Worten.
The speaker welcomed the guests with carefully chosen words.