The meaning highly dependents on the context:



استیفاء
vindication, taking advantage, utilisation

taking advantage; utilization

استیفاء از عمل غیر
taking advantage of others activities

استیفاء حق
vindication of right; attaining the right

استیفاء منفعت
to get benefit; to benefit

استیفاء کردن
vindicate

اهلیت استیفاء
capacity to exercise one's rights

capacity to exercise rights and discharge obligations

حق اجرا (حق استیفاء)
use of civil rights

حق استیفاء
right of executing the civil rights
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A Comprehensive Persian-English Dictionary

استیفاء
/istīfāʼ /
A
(v.n. 10 of وفی) Demanding and receiving the whole of what is due; performance of a promise; renouncing, relinquishing, resigning (an appointment).
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nm. fulfillment, meeting (of conditions); collection (of dues)






Haïm Persian-English Dictionary

استیفاء
(esteefa ')
Noun A (Demanding) the fulfilment of a promise. Receiving the whole (amount) of what is due.


Copyright © 1934 by Librarie-imprimerie Béroukhim.


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Note added at 21 hrs (2020-12-12 21:15:47 GMT)
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Corpus:
ماده 780 برای استیفاء طلب خود از قیمت رهن مرتهن بر هر طلبکار دیگری رجحان خواهد داشت.
Article 780 - The creditor who holds the pledge has preference over every other claimant in the settlement of his claim from the price of the pledged thing.
قانون مدنی

ماده 948 هرگاه ورثه از اداء قیمت امتناع کنند زن می تواند حق خود را از عین اموال استیفاء کند.
Article 948 - If, in the circumstances of the previous Article, the heirs refuse to pay the price of the building and the trees, the woman may realise her right on those thing from the thing themselves.
قانون مدنی

4 - مورد رهن پس از تصرف موقتی مرتهن مجداداً به تصرف راهن داده شد تا طی مدت دو ماه تعیین شده جهت تادیه الباقی ثمن معامله از آن به رایگان استیفای منافع کند.
4. The mortgaged premises, after an interim possession by the mortgagee, were once again to the repossession of the mortgagor so that he enjoy possessory interests, free of charge, for the two months period mentioned above.
سند رهن