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Explanation: mother: 'umm أم (u is close to double o in look or good)
the mother: al'umm الأم
my mother:'ummee أمي
mother is also: waalida
the mother: alwaalida
my mother: walidati والدتي
'umm is more common than walida
This answer in no way abnegates or contardicts Alaa's and Raghad's answers, with which I thoroughly agree. I merely wish to add the invocative form, the form used when addressing one's own mother. This is the form commonly used where I grew up, but there are other, slightly different forms used in different regions. These include YUMMA (common in Iraq) and, my favorite, UMMAYI.
Pronunciation point: The A in UMMAH is long, like the A in "father." The stress is on the second syllable.