Preponderant (adjective)

1. Having greater weight, influence, or importance.
2. Dominating or prevailing over all others.

Origin:

Late 16th century; from latin praeponderant- 'weighing more', from the verb praeponderare, from prae 'before' + pondus 'weight'.

Examples:

1. The preponderant color scheme in the room was blue and white.
2. The preponderant reason for their success was their hard work and determination.
3. She had a preponderant influence on her children's upbringing.
4. The preponderant opinion among the experts was that the project was viable.
5. The preponderant economic power of the country made it a leader in the region.