secul- +

(Latin: from Old French seculer; from Late Latin sæcularis, worldly, living in the world, not belonging to a religious order; from saecularis, pertaining to a generation or age; from saeculum, saeclum, period of a man's life, generation; period of a hundred years)

secular
1. Worldly rather than spiritual.
2. Not specifically relating to religion or to a religious body: "They were playing secular music instead of sacred hymns."
3. Relating to or advocating secularism.
4. Not bound by monastic restrictions; especially, not belonging to a religious order (a reference to the clergy).
5. Occurring or observed once in an age or century.
6. Lasting from century to century.
7. Etymology: it was used in early Christian texts for the "temporal world"; as opposed to the "spiritual world"; and that was the sense in which its derived adjective Latin saecularis passed via Old French seculer into English.

The more familiar modern English "non-religious" meaning came into the language at about the 16th century.

secularism
1. A doctrine that rejects religion and religious considerations.
2. A secular spirit or tendency; especially, a system of political or social philosophy that rejects all forms of religious faith and worship.
2. The view that public education and other matters of civil policy should be conducted without the introduction of a religious element.

The fundamental principle of secularism is that, in his whole conduct, man should be guided exclusively by considerations derived from the present life itself. Anything that is above or beyond the present life should be entirely overlooked.

Whether God exists or not, whether the soul is immortal or not, are questions which at best cannot be answered, and on which consequently no motives of action can be based.

secularist
1. An advocate of secularism; someone who believes that religion should be excluded from government and education.
2. Generally a reference to an ideology that promotes the secular; as opposed to the religious, particularly within the public sphere.
secularistic
1. Leaning toward religious skepticism or indifference.
2. The view that religious considerations should be excluded from civil affairs or public education.
secularity
1. The condition or quality of being secular.
2. Something secular.
secularization
1. The transfer of property from ecclesiastical to civil possession.
2. A procedure of changing something (art or education or society or morality etc.) so it is no longer under the control or influence of religion.
3. The process of becoming secular; the separation of civil or educational institutions from ecclesiastical control.

Secularization is also defined by some as the process in which mystical, sacred, and otherworldly explanations, outlooks, beliefs, interests, and concerns are replaced by rational, critical evaluations and by pragmatic and utilitarian standards.

secularize, secularizing, secularized
1. To transfer something from a religious to a nonreligious use, or from control by a religious body to control by the state or a lay body.
2. To remove the religious dimension or element from something, or otherwise make it secular.
3. To make secular; separate from a religious or a spiritual connection or influences.
4. To make worldly or unspiritual; to imbue with secularism.
secularly
In a worldly, or physical, manner.
secularness
The quality, disposition, or state of being secular; worldliness; worldly-mindedness.
supersecular
Being above the world, or secular things.
unsecularize
1. To cause to become non secular.
2. To detach from secular things.
3. To alienate oneself from the world.