
die Entfaltung
development
The process by which abilities, personality, or potential develop and fully come into their own.
Die Schule soll ein Ort zur freien Entfaltung der Kinder sein.
School should be a place for the free development of children.
development / unfolding
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development
The process by which abilities, personality, or potential develop and fully come into their own.
Die Schule soll ein Ort zur freien Entfaltung der Kinder sein.
School should be a place for the free development of children.

unfolding
The physical opening or spreading out of something that was folded, such as a blossom or a map.
Wir beobachteten die langsame Entfaltung der Rosenblüte.
We watched the slow unfolding of the rose blossom.
The word comes from the verb 'entfalten' (to unfold / to develop). 'Falten' means to fold something up. The prefix 'ent-' reverses this process. 'Entfaltung' is therefore the 'unfolding'—either literally with a blossom or figuratively with abilities.
Im Frühling entfalten die Bäume ihre Blätter.
In spring, the trees unfold their leaves.
You can tell from the context whether the literal or figurative meaning is intended. If it is about abstract things like 'Persönlichkeit' (personality), 'Talent' (talent), or 'Potenzial' (potential), it refers to development. If it is about concrete objects like 'Blüte' (blossom), 'Schirm' (umbrella/parachute), or 'Karte' (map), it refers to physical opening.
Er braucht Raum für die Entfaltung seiner Kreativität.
He needs space for the development of his creativity.
There are fixed expressions in connection with personal development. When abilities 'zur Entfaltung kommen' (come into full development), they develop fully. When you help someone use their potential, you 'bringt man seine Fähigkeiten zur Entfaltung' (bring their abilities to full development).
In diesem kreativen Umfeld konnte ihr Talent endlich zur Entfaltung kommen.
In this creative environment, her talent was finally able to come into full development.
In the literal meaning, 'Entfaltung' (unfolding) is often combined with things that open slowly and often in a natural way. Typical examples are 'die Entfaltung einer Blüte' (the unfolding of a blossom), 'eines Schmetterlings' (of a butterfly), or 'eines Fächers' (of a fan).
Die Entfaltung des Schmetterlings aus seinem Kokon ist faszinierend.
The unfolding of the butterfly from its cocoon is fascinating.
development
Entwicklung generally describes how abilities or personality gradually change and grow. Entfaltung places greater emphasis on existing abilities or potential emerging and fully coming into their own. Without this focus on existing potential, Entwicklung is the better fit.

Die Entfaltung ihres musikalischen Talents wurde durch den passenden Unterricht gefördert.
The unfolding of her musical talent was encouraged by the right kind of instruction.
Die Entwicklung ihrer musikalischen Fähigkeiten wurde über mehrere Jahre deutlich.
The development of her musical abilities became clearly noticeable over several years.