enlightenment
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realization
A sudden, deep mental insight through which you fully understand a complex matter or problem all at once.
Nach stundenlangem Grübeln über die Matheaufgabe kam mir plötzlich die Erleuchtung.
After hours of puzzling over the math problem, I suddenly had a realization.
enlightenment
In a religious and spiritual context, especially in Buddhism, the highest goal of awakening: a state of complete wisdom and liberation from all suffering.
Im Buddhismus ist die Erleuchtung das Ende des Kreislaufs der Wiedergeburten.
In Buddhism, enlightenment is the end of the cycle of rebirth.
illumination
An outdated or very elevated, poetic term for the lighting of a room or place by a light source.
Die einzige Erleuchtung des Gewölbes spendete eine einzelne Fackel an der Wand.
The only illumination of the vault came from a single torch on the wall.
The word is derived from the verb 'erleuchten' (to illuminate/enlighten), which means 'to make bright.' All meanings relate to this idea of light: either as sudden mental clarity, as spiritual light, or as actual physical light.
Eine gute Erklärung kann ein schwieriges Thema erleuchten.
A good explanation can shed light on a difficult topic.
In everyday language, 'Erleuchtung' (realization/enlightenment) is often used slightly ironically for a sudden, simple insight. Typical phrases are 'eine Erleuchtung haben' (to have a sudden realization) or 'jemandem kommt die Erleuchtung' (the realization comes to someone).
Als ich die Lösung sah, hatte ich eine plötzliche Erleuchtung.
When I saw the solution, I had a sudden realization.
This meaning is almost exclusively limited to religious or philosophical contexts, especially Buddhism. It describes a deep spiritual goal, not an everyday idea.
Viele meditieren, um den Zustand der Erleuchtung zu erreichen.
Many people meditate in order to reach the state of enlightenment.
This meaning for physical light is very rare today and sounds poetic or old-fashioned. In normal usage, the word 'Beleuchtung' (lighting) is used instead.
Kerzen sorgten für die spärliche Erleuchtung des Raumes.
Candles provided the sparse illumination of the room.
insight / finding
Erkenntnis and Erleuchtung can both refer to a mental insight. An Erkenntnis can develop gradually through experience or reflection. Erleuchtung, by contrast, emphasizes that someone suddenly and comprehensively understands a difficult connection.
Beim letzten Gespräch hatte Lea plötzlich die Erleuchtung und verstand den ganzen Fehler in ihrem Plan.
During the last conversation, Lea suddenly had a realization and understood the entire mistake in her plan.
Nach mehreren Gesprächen gewann Lea die Erkenntnis, dass ihr ursprünglicher Plan nicht funktionieren konnte.
After several conversations, Lea realized that her original plan could not work.
