Learn Farsi: این موفقیت یک دستاورد بزرگ برای بشریت است. - This success is a great achievement for humanity.

It is built from the Arabic loanword bashar (human being, mankind). By adding the Arabic suffix -iyyat, it turns into the abstract noun bashariyyat (humanity). This suffix is highly productive in formal Farsi for elevating adjectives or basic nouns into abstract concepts.

Is movaffaghiyyat (success) another example of the -iyyat suffix?

Yes! The base word is the adjective movaffagh (successful). Adding the -iyyat suffix transforms it into the abstract noun movaffaghiyyat (success). This sentence actually contains two great examples of the target grammar.

Why is the suffix pronounced "-iyyat" when it's just written as یت?

In standard Persian writing, short vowels and the tashdid (a small symbol that shows a doubled consonant) are almost always left out. If fully vocalized, it would be written ـیَّت to show the doubled yeh sound and the short a. As a learner, whenever you recognize this abstract noun pattern, you just have to remember to pronounce the hidden "-iyyat".

Could I use ensaniyyat instead of bashariyyat in this sentence?

It wouldn't quite fit the meaning here. While both use the -iyyat suffix, bashariyyat refers to the human race collectively (mankind). Ensaniyyat, on the other hand, usually refers to "humanity" as a moral virtue, meaning compassion, kindness, or acting humane.