This is the 193rd most frequent Arabic word.
لقد
"Indeed" or "Certainly" (used for emphasis).
The usage of 'لقد' here emphasizes the completion of the action in the past.
لقد قرأتُ هذا الكتاب.
I have read this book.
In this sentence, 'لقد' implies a consideration of the speaker's experience in the past.
لقد كنتُ في السوق صباحًا.
I had been at the market this morning.
Here, 'لقد' is used to express surprise or emphasis regarding the accomplishment in the past.