Scientific temper is defined as a state of mind that only accepts truth and thinks logically and rationally. It involves applying the scientific method like questioning, observing, and analyzing in daily life. Scientific temper was coined by India's first Prime Minister Jawaharlal Nehru and is mentioned in the Indian Constitution as important for socio-economic development. It encourages self-learning, believing in facts based on evidence, developing thinking capabilities, and acquiring new knowledge while reducing superstitions in society.