Disunion (noun)

1. A state of being separated or divided into parts.
2. A break in unity, a state of disunity, especially in a political or social organization.
3. Dissolution of a union or organization.

Origin:

From the latin word 'dis' meaning 'apart' and 'uniō' meaning 'to join'.

Examples:

1. The country was threatened with disunion, as different regions sought independence.
2. The disunion of the political party caused many members to leave and form new organizations.
3. The disunion of the family resulted in years of bitterness and estrangement.
4. The disunion of the company was a major loss for the industry.
5. The disunion of the alliance was a significant blow to their cause.