Ab or Av (Ab; related to Akkadian abu), sometimes Aba or Abba, means "father" in most Semitic languages.

Based on this passage, what is the meaning of abba in hebrew? Let's give stream of consciousness first:
The relevant sentence in the passage is: Ab or Av (Ab; related to Akkadian abu), sometimes Aba or Abba, means "father" in most Semitic languages.
So, the final answer is father.