
drei
three
The cardinal number that follows the number 2 and comes before the number 4; the numeral 3.
Das Auto hat drei Jahre Garantie.
The car has a three-year warranty.
three
Loading your saved state.

three
The cardinal number that follows the number 2 and comes before the number 4; the numeral 3.
Das Auto hat drei Jahre Garantie.
The car has a three-year warranty.

to be unable to count to three
An idiom describing someone as being considered very stupid or simple-minded.
Er ist so begriffsstutzig, der kann ja nicht mal bis drei zählen.
He's so slow on the uptake, he can't even count to three.

third time's the charm
A proverb expressing that a third attempt often leads to success, or that something is complete or especially good in a group of three.
Nach zwei Fehlschlägen hat es endlich geklappt – aller guten Dinge sind drei.
After two failures, it finally worked—third time's the charm.
The number 'drei' (three) is the basis for many compound words. If you see 'drei-' at the beginning of a word, it almost always refers to the number.
Ein Kind mit einem Dreirad fuhr vorbei.
A child on a tricycle rode by.
The number 'drei' (three) can also be used as a noun, for example to refer to a school grade or a house number. Then it is capitalized: 'die Drei' (the three).
Sie wohnt in der Hausnummer Drei.
She lives at house number three.
The idiom 'nicht bis drei zählen können' (to be unable to count to three) is used to express that someone is perceived as very stupid or slow-thinking. It is never meant literally.
Frag ihn nicht nach dem Weg, der kann doch nicht bis drei zählen.
Don't ask him for directions; he can't even count to three.
'Aller guten Dinge sind drei' (third time's the charm) is a well-known proverb. It is often used to encourage yourself or others when the first two attempts were unsuccessful.
Mein erster Kuchen war verbrannt, der zweite zu trocken. Aber aller guten Dinge sind drei!
My first cake was burned, the second was too dry. But third time's the charm!
third
Drei states the number of people or things and can accompany a noun. Dritt refers here to a group of three people and is used in the fixed expression zu dritt. Use drei when counting, but zu dritt when three people are acting together.

Drei Kollegen arbeiten heute gemeinsam an dem Projekt.
Three colleagues are working on the project together today.
Wir arbeiten heute zu dritt an dem Projekt.
The three of us are working on the project together today.