What is the meaning of أم?

mother

origin

source

indicates an exclusive disjunction introduced with أَ (ʔa), as in alternative questions

indicates an inclusive disjunction introduced with أَ (ʔa) that denotes sameness, indistinguishability, unimportance, insignificance, or indifference

to go, to go to see, to repair (to a place)

to lead the way, to lead by example

to lead in prayer

verbal noun of أَمَّ (ʔamma) 

to become a mother

mother, mom

feminine of أبو (abū)

alternative form of إم (ʔimm)

Source: wiktionary.org