dominant
Describing a person who likes to have control and direct others; commanding.
In der Gruppe war er der dominante Charakter, der alle Entscheidungen traf.
In the group, he was the dominant character who made all the decisions.

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Describing a person who likes to have control and direct others; commanding.
In der Gruppe war er der dominante Charakter, der alle Entscheidungen traf.
In the group, he was the dominant character who made all the decisions.

'Dominant' can be used not only as an adjective before a noun or with 'sein' (to be), but also as an adverb. It then describes the manner of an action, often in the combination 'dominant auftreten' (to come across/act in a dominant way).
Er versucht immer, in Diskussionen sehr dominant aufzutreten.
He always tries to come across as very dominant in discussions.
When talking about personality, 'dominant' is often combined with nouns such as 'Charakter' (character), 'Verhalten' (behavior), or 'Persönlichkeit' (personality). It describes a person who tends to take the lead.
Sie hat ein dominantes Verhalten, das nicht jeder mag.
She has dominant behavior that not everyone likes.
In the meaning 'vorherrschend' (predominant), 'dominant' often describes abstract things or features. Typical combinations are 'eine dominante Rolle spielen' (to play a dominant role), 'die dominante Farbe' (the dominant color), or 'das dominante Thema' (the dominant theme).
In seiner Architektur spielt Glas eine dominante Rolle.
Glass plays a dominant role in his architecture.
In biology and genetics, 'dominant' has a very specific, technical meaning. It describes an inherited trait that prevails over another. In music theory, it is also a technical term for a specific scale degree.
Das Gen für dunkle Haare ist oft dominant.
The gene for dark hair is often dominant.
predominantly
'überwiegend' and 'dominant' can both show that something is stronger or more important than something else. However, 'überwiegend' mainly describes quantity or proportion: something makes up the largest part. 'dominant' describes what stands out especially strongly or plays the most important role. The words can be confused because both can refer to something predominant. A practical tip: 'überwiegend' fits with majorities and proportions, while 'dominant' fits with a particularly strong feature, color, topic, or influence.

In der Küche ist der Geruch von Knoblauch sehr dominant.
In the kitchen, the smell of garlic is very dominant.
In dem Kurs sprechen die Teilnehmer überwiegend Deutsch.
In the course, the participants speak predominantly German.