I don't understand this sentence. What _____?

Does this word mean

Mean this word

Means this word

Does mean this word

"I don't understand this sentence. What does this word mean?"

مجھے یہ جملہ سمجھ نہیں آیا۔ اس لفظ کا کیا مطلب ہے؟

"Does this word mean" correctly forms a question asking for the definition of the word.