SECULAR -

General meaning:

Not connected with religious or spiritual matters.

Source: https://www.google.co.in/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=secular+meaning

History of the word:

The term "secularism" was first used by the British writer George Jacob Holyoake in 1851.^[5] Although the term was new, the general notions of freethought on which it was based had existed throughout history.

Holyoake invented the term "secularism" to describe his views of promoting a social order separate from religion, without actively dismissing or criticizing religious belief. An agnostic himself, Holyoake argued that "Secularism is not an argument against Christianity, it is one independent of it. It does not question the pretensions of Christianity; it advances others. Secularism does not say there is no light or guidance elsewhere, but maintains that there is light and guidance in secular truth, whose conditions and sanctions exist independently, and act forever. Secular knowledge is manifestly that kind of knowledge which is founded in this life, which relates to the conduct of this life, conduces to the welfare of this life, and is capable of being tested by the experience of this life."^[6]

Source:  http://en.wikipedia.org/wiki/Secularism

More Details:

Secular ethics - Secularism is a code of duty pertaining to this life, founded on considerations purely human, and intended mainly for those who find theology indefinite or inadequate, unreliable or unbelievable. Its essential principles are three: (1) The improvement of this life by material means. (2) That science is the available Providence of man. (3) That it is good to do good. Whether there be other good or not, the good of the present life is good, and it is good to seek that good.^[24]

Source:  http://en.wikipedia.org/wiki/Secularism#Secular_ethics

India’s view on Secular:

Secularism in India means equal treatment of all religions by the state. Unlike the Western concept of secularismwhich envisions a separation of religion and state, the concept of secularism in India envisions acceptance ofreligious laws as binding on the state, and equal participation of state in different religions.^[1][2]

Source: http://en.wikipedia.org/wiki/Secularism_in_India

My Understanding:

Individuals have the right to do what they are interested
condition: outcomes or Reactions of individuals should not affect the society in a negative way