Do you mean to ask if it is used in the English language? The answer is that it is.
Liquidity is used in the financial sector to mean the availability of liquid assets (meaning things like cash) to a market or company. The word first appeared in the 1610s from the Late Latin liquiditatem (liquiditas) and related to the French liquidité.
Liquidity is generally pronounced (using the International Phonetic Alphabet) as /lɪˈkwɪdɪti/ although other pronunciations may exist. There are four syllables with the stress on the second syllable (roughly li-KWI-di-ty).
If you want to learn more about the International Phonetic Alphabet, you can find a guide here: International Phonetic Alphabet and Phonemic Alphabets