They both mean "the start", "the beginning", or "the origin". In conversations, you may use them interchangeably. In formal writing, "simula" is almost always the one used.
15 เมษายน 2014
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As far as I know, "umpisa" comes from the Spanish "empezar", while "simula" is its pre-Hispanic Tagalog equivalent.
15 เมษายน 2014
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They have the same meaning and I think they can interchange.