pronoun
this one (masculine)
B1
Meaning: 'dieser' = this one (masculine); a demonstrative pronoun/determiner. It inflects for gender, case and number (dieser, diese, dieses, dieses etc.). Used attributively before nouns or pronominally to replace masculine nouns in nominative case. Pay attention to agreement with case and gender.
Examples
Dieser ist mein Bruder.
This one is my brother.
Der Richter betonte, dass dieser Beweis wichtig war, doch das Urteil wurde später angefochten.
The judge emphasized that this piece of evidence was important, but the verdict was later challenged.
Details
Mnemonics
Point at a man and mentally label him 'dieser'.
Sounds like 'dear sir' — imagine pointing at a man and saying 'this one'.
Masculine correlates with 'der' — both start with 'd', so think 'der' → 'dieser'.
Notes
Demonstrative pronoun used for masculine referents; can also be used attributively (dieser Mann) as a determiner.