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Parameshwara or Parameshwar, also transliterated from Sanskrit in other ways, is a Hindu concept literally meaning the Supreme God. The word "param" meaning the highest is added to Ishwara to intensify the title of God.
Same as Absolute Reality or Absolute Truth (See Para Brahman). The term Parameshwara (Supreme Lord) is used specifically indicate The Supreme Personality of Godhead, who is also the “supreme controller”. And yet it is common that in many Vedic scriptures the term Ishvara is used as a short form for Parameshwara. According to Shaiva puranas and siddhantas, Lord Shiva is Parameshwara. According to Vaishnavite scriptures, Lord Narayana, also known as Vishnu or Hari is Parameshwara. Also note that the term Maheshvara is also used as a synonym to denote Lord Shiva.
In Hindi Bible 
In Hindi Bible, Genesis and other books, word God is translated as Parameshvara. For example, आदि में परमेश्वर ने आकाश और पृथ्वी को बनाया means "In the beginning God created the heaven and the earth", where परमेश्वर (Parameshvara) means "God". Usage of sanskrit philosophical terms of Vedas in Hindi Bible (and other indian versions of Bible) is one of the reasons why christianity is not so widespread as sanatana dharma (vedic culture) in India.
See also