It means اصرار pronounced "iisrar" all dialects use yhe same wird as in MSA .

Hi! The word is "مُثابَرَةٌ" (in MSA) You can use the online "reverso" dictionary for MSA. Just look up "Arabic reverso". It'll give you the meaning of the word along with the pronunciation (at least most of the time) and also some sample sentences. Apart from that, you can use the online dictionary المعاني

Means الإصرار or المثابرة or الثبوت or الدوام or الاستمرارية