This is the 81st most frequent Hindi word.
नई
"नई" means "new" in English.
The word 'नई' means 'new' here and is used as an adjective describing the noun 'किताब' (book).
मेरे पास एक नई किताब है।
I have a new book.
'नई' is describing 'नौकरी' (job) here, indicating that the job is new.
मैंने नई नौकरी शुरू की है।
I have started a new job.
In this sentence, 'नई' describes the noun 'दुकान' (shop), signifying that the shop is recently established.