universell
universal
Generally valid, applicable or relevant to everyone and everywhere.
Die Sprache der Musik ist universell und wird auf der ganzen Welt verstanden.
The language of music is universal and is understood all over the world.

universal
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universal
Generally valid, applicable or relevant to everyone and everywhere.
Die Sprache der Musik ist universell und wird auf der ganzen Welt verstanden.
The language of music is universal and is understood all over the world.

'Universell' (universal) is related to 'Universum' (universe) and 'Universität' (university). The shared root points to the idea of 'totality' or 'all-encompassing'. So a universal law applies to everyone, and a universal tool can be used for everything.
Die Gesetze der Physik sind universell.
The laws of physics are universal.
You can recognize the meaning from the noun. In connection with abstract concepts like 'Rechte' (rights), 'Werte' (values), or 'Sprache' (language), 'universell' means something like 'universally valid'. In connection with concrete objects like 'Werkzeug' (tool) or 'Adapter' (adapter), it means 'versatile' or 'usable in many ways'.
Menschenrechte sollten universell sein.
Human rights should be universal.
A very common and useful combination is 'universell einsetzbar' (usable in many ways / universally applicable). This phrase describes that something can be used for many different purposes or in many situations.
Diese Software ist flexibel und universell einsetzbar.
This software is flexible and versatile.
general
'allgemein' and 'universell' can both mean that something does not apply only to one single case. 'allgemein' often means: it concerns many people or things, or does not apply specifically to one person or situation. 'universell' is stronger: it means that something is applicable everywhere or in all cases. Learners may confuse the words because both are opposites of 'speziell'. As a simple guide: for normal rules, tips, or statements, 'allgemein' usually fits. For very broad validity, for example with principles, values, or solutions, 'universell' is more precise.

Ein Lächeln ist eine universelle Form der Freundlichkeit.
A smile is a universal form of kindness.
Der Arzt gibt mir zuerst allgemeine Tipps für mehr Bewegung.
The doctor first gives me general tips for getting more exercise.