der Sinn
meaning / purpose
The meaning, purpose, or intention behind a thing, action, or life itself.
Was ist der Sinn dieser neuen Regelung?
What is the purpose of this new regulation?

meaning / sense
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meaning / purpose
The meaning, purpose, or intention behind a thing, action, or life itself.
Was ist der Sinn dieser neuen Regelung?
What is the purpose of this new regulation?

The word 'Sinn' (meaning/sense) is the basis for many other important words. These include the adjectives 'sinnvoll' (meaningful/sensible) and 'sinnlos' (meaningless/pointless), as well as the noun 'Unsinn' (nonsense).
Es ist sinnvoll, sich gut auf die Prüfung vorzubereiten.
It makes sense to prepare well for the exam.
When asking about the purpose or meaning, you often use the structure 'der Sinn von' (the meaning/purpose of) with the dative or a genitive construction.
Ich verstehe den Sinn von dieser komplizierten Regel nicht.
I don't understand the point of this complicated rule.
In the plural, 'die Sinne' (the senses) usually refers to the five classic forms of perception. These are often formed as compound words with '-sinn' (-sense): Sehsinn (sense of sight), Hörsinn (sense of hearing), Geruchssinn (sense of smell), Geschmackssinn (sense of taste), and Tastsinn (sense of touch).
Der Tastsinn ist bei blinden Menschen oft besonders gut entwickelt.
The sense of touch is often especially well developed in blind people.
The expression 'Sinn für etwas haben' (to have a sense for something) means to have a special feeling or talent for an area. The 'etwas' is always in the accusative.
Er hat wirklich einen ausgeprägten Sinn für Gerechtigkeit.
He really has a strong sense of justice.
To express that something is logical, the verbs 'ergeben' (to result in/make) and 'machen' (to make) are used. Both are very common, especially in spoken language.
Deine Erklärung ergibt endlich Sinn.
Your explanation finally makes sense.
The expression 'etwas im Sinn haben' (to have something in mind) means to have an intention or to be thinking of something. The preposition 'im' (in dem) is a fixed part of the expression here.
Er hat uns nicht verraten, was er mit dem alten Haus im Sinn hat.
He didn't tell us what he has in mind for the old house.
reason / ground
'der Grund' and 'der Sinn' can both explain why you do something or why something is important. 'Der Grund' is more about the cause or occasion: What triggered something? 'Der Sinn' is more about the purpose, meaning, or whether something is logical and useful. Learners often confuse the words because in both cases you can ask 'why'. If you want to name the cause, 'Grund' fits. If you mean the purpose or meaning, 'Sinn' is a better fit.

Zum Üben besprechen wir den Sinn dieser Aufgabe noch einmal.
For practice, we discuss the point of this exercise once again.
Vor dem Termin nennt Lisa den Grund für ihre Absage.
Before the appointment, Lisa gives the reason for her cancellation.