1. to divide into fractions or smaller parts
Usage: chiefly British spelling; American English typically uses 'fractionalize'
2. to separate or cause to separate into opposing factions or groups
Usage: often used in political or social contexts

Examples

• The company decided to fractionalise its large holdings into smaller investment units.
• Political disagreements began to fractionalise the once-unified party.
• The process will fractionalise the crude oil into different components.
• Competing interests threatened to fractionalise the coalition government.
• Scientists fractionalised the protein sample for detailed analysis.
• Economic pressures fractionalised the community into separate groups.