For this chain-of-thought reasoning and answer, what was the question?
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.
A: father
Q: 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?