Enlightenment is a word coined for self realization in the western world. Self realization existed thousands of years before the word enlightenment came into being.
Reaching god, realizing God… reaching state of self realization, god realization all meant the same. Right from times of Yajnavalkya (composer and compiler of most voluminous Brihadaranyaka Upanishad) all renowned sages and Rishis succeeded in reaching god in their lifetime. All realized self, realized god, reached state of self realization in their lifetime.
The word enlightenment came into existence after advent of Jesus Christ and Prophet Mohammed. Both Jesus Christ and Prophet Mohammed succeeded in gaining enlightenment in their lifetime. In the West only two seekers Jesus Christ and Prophet Mohammed succeeded in reaching state of self realization whereas in Hinduism hundreds succeeded in realizing self, realizing God in their lifetime.
Enlightenment stands for the state when the soul of a human being reaches state of absolute purity. For an enlightened one the circle of life, the cycle of birth and death finally ends.
Enlightenment is gained by full awakening of kundalini shakti, the coiled Serpentine energy lying dormant in base of spine. This is made possible by practice of absolute celibacy for a minimum period of 12 years in continuation. Jesus Christ practiced absolute celibacy while in erstwhile Bharatvarsha (now India) during his missing years (aged 14 to 29).
Prophet Mohammed practiced absolute celibacy when he sealed himself inside a cave on Mount Hira.
To reach state of enlightenment practice of both absolute celibacy and kundalini awakening is an absolute must. Only then our brain activates 100%. The brain of normal human beings from the beginning activated 1 to 2%. Indulging in spirituality when human beings successfully awakened kundalini energy fully, the brain worked to full 100% capacity.
100% activation of brain means becoming knower of all, gaining enlightenment that very moment.
After Jesus Christ and Prophet Mohammed, none in the western world successfully indulged in spirituality to reach state of enlightenment like Jesus Christ and Prophet Mohammed. Comparatively in India in the last about 150 years amongst 7 billion people existing world over Sri Ramakrishna Paramhansa and Maharshi Ramana successively indulged in spirituality to reach state of enlightenment, state of self realization, God realization.