Islam!! What is the meaning of Kafir.. according to Holy Quran..?

It means "Learn to use Google, brainiac"

1) ‘Kafir’ used in the Political/Legal/Social/Community sense in the Quran

The word Kafir can be used to describe a community, people or background of a person, without being a final theological indictment (of their destination in the afterlife) against them. Here are two examples:1) Kafir as a generic word for non-believer / unbelieverThis description refers to using the word ‘Kafir’ to mean all ‘non-believers’ in Islamic revelation. This is not the same as the English term ‘disbeliever’, since someone who is not a believer in revelation may be sincere and be willing to challenge their society’s assumptions, and search for and accept the truth if they find it. Since they are not convinced yet or aware of Islam they do not label themselves as Muslim. They may come from a situation or society where the actual truth is unclear, unknown and therefore covered from them. The category is used in Quran 60:5 and tells Muslims of the prayer of Abraham (pbuh) that he did not want to be a trial or torment for those who are non-believers in his message. The verse then goes on to talk about showing kindness and being just to non-believers [Quran 60:8], except those who actively fight and unjustly expel believers from their homes due to their beliefs.

2) Kafir as a word for pagans/polytheists exclusively (and not ‘people of the Book’ i.e. those following Judaism and Christianity)

While the Quran can use ‘Kafir’ in a general sense to mean all non-believers of Islam (including people of other Abrahamic faiths), it sometimes uses the word ‘Kafir’ to describe (7th century Arabian) pagans exclusively. This usage does not include the people of the book, who are believers in the previous revelations from God, whereas the pagans and polytheists (in this example in Arabia) are believers in no revelation. So in this usage of the word ‘Kafir’, this case only refers to those pagans, and not Jews and Christians. One example of this specific usage and meaning is when the Quran prohibits Muslims from marrying ‘Kufaar’ (pagans [Quran 60:10]) whereas Muslims are not prohibited from marrying ‘people of the Book’ [Quran 5:5].