This is the 479th most frequent Turkish word.
ab
The Turkish word "ab" means "water."
In this sentence, 'Ab' is a part of the name 'Abdurrahman' and does not carry a standalone meaning.
Abdurrahman, okula gitti.
Abdurrahman went to school.
Here, 'Ab' is used in an archaic sense referring to water, showing an uncommon or poetic usage in Turkish.
Ab, suyun diğer bir adıdır.
'Ab' is another name for water.
In this example, 'Abi' (plural: 'Abiler') means older brother or figuratively a respected male figure, and is a common usage in daily conversation.