Espousal (noun)

1. The act of getting married or taking someone as a spouse.
2. The act of taking up a cause, belief, or idea and supporting it.
3. The act of making a promise to support or defend something.

Origin:

Derived from the verb 'espouse' which means to marry or take as a spouse.

Examples:

1. The espousal ceremony was a joyous celebration of the couple's love and commitment.
2. The espousal of environmental causes has become a priority for many young people.
3. The politician's espousal of the new economic policy was a major turning point in the election campaign.
4. The espousal of the new religion was a significant event in the history of the kingdom.
5. The company's espousal of sustainable business practices has earned them a reputation for being environmentally responsible.