
die Klasse
class
A group of students who are taught together at a school; a grade level.
Die Klasse 8b macht nächste Woche einen Ausflug.
Class 8b is going on a trip next week.
class
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class
A group of students who are taught together at a school; a grade level.
Die Klasse 8b macht nächste Woche einen Ausflug.
Class 8b is going on a trip next week.

class
A category or quality level into which people or things are classified.
Das Restaurant bietet eine Küche der Extra-Klasse.
The restaurant offers cuisine of the highest class.

class
A social stratum within a society, defined by shared economic or social characteristics.
Die industrielle Revolution führte zur Entstehung der Arbeiterklasse.
The Industrial Revolution led to the emergence of the working class.

great
Colloquial expression of approval; means 'great' or 'excellent'.
Dass du das für mich erledigt hast, finde ich wirklich Klasse!
I think it's really great that you took care of that for me!

classroom
The room where lessons for a school class take place; the classroom.
Bitte geht nach der Pause leise zurück in die Klasse.
Please go back to the classroom quietly after the break.

class
A rank in biological taxonomy that stands between phylum and order.
In der Biologie gehören die Vögel zur Klasse der Aves.
In biology, birds belong to the class Aves.
The word 'Klasse' (class) is the basis for other words such as 'klassisch' (classical/classic) or the verb 'klassifizieren' (to classify). All these words share the basic idea of dividing things into groups or categories.
Die Biologen klassifizieren die neue Art.
The biologists are classifying the new species.
As an expression of enthusiasm, 'Klasse!' (Great!) is used like an adjective or an interjection and is not declined. You can use it as a standalone exclamation or in a sentence.
Du hast die Prüfung bestanden? Klasse!
You passed the exam? Great!
In a school context, 'Klasse' can mean the group of students or the classroom. Verbs of movement such as 'gehen' (to go) or 'kommen' (to come) usually point to the room ('in die Klasse gehen' = to go into the classroom). 'In der Klasse sein' can mean both.
Die Schüler gehen nach der Pause zurück in die Klasse.
The students go back to the classroom after the break.
In the school context, the prepositions and case are important. 'In der Klasse sein' (to be in the class; dative) describes membership or location. 'In die nächste Klasse kommen' (to move on to the next grade; accusative) describes promotion at the end of the school year.
Meine Tochter ist jetzt in der dritten Klasse.
My daughter is now in third grade.
To express high quality, 'Klasse' is often used in fixed expressions or compounds. Examples are 'Spitzenklasse' (top class), 'Extraklasse' (extra class/outstanding quality), or the expression 'eine Klasse für sich sein' (to be in a class of one's own).
Dieses Hotel ist eine Klasse für sich.
This hotel is in a class of its own.
In the meaning 'soziale Schicht' (social class), the word is mainly used in sociological, historical, or political texts. It is often part of compounds such as 'Arbeiterklasse' (working class) or 'Mittelklasse' (middle class).
Die Gesellschaft war in verschiedene Klassen unterteilt.
Society was divided into different classes.
great / mad
„Klasse“ and „toll“ can colloquially express the same enthusiasm. In this use, „klasse“ normally remains unchanged, while „toll“ can be inflected like an ordinary adjective. Before a noun, a form of „toll“ is therefore usually used.

Ich finde das neue Konzertprogramm klasse.
I think the new concert program is great.
Ich finde das neue Konzertprogramm toll.
I think the new concert program is great.