predominance n.

1570s, "ruling; controlling; exerting power, authority, or influence," from French prédominant (14c.), from Medieval Latin *praedominantem (nominative praedominans), present participle of *praedominare, from Latin prae "before" (see pre-) + dominari "to rule, dominate, to govern," from dominus "lord, master," from domus "house" (from PIE root *dem- "house, household"). Weakened sense of "more frequent, prevalent" is from c. 1600. Related: Predominantly.

Predominant implies activity, and actual or figurative effort after leadership on the part of that which is predominated over: as, a predominant faction; a predominant opinion is one that seems to put down all others. [Century Dictionary]

word-forming element attached to verbs to form abstract nouns of process or fact (convergence from converge), or of state or quality (absence from absent); ultimately from Latin -antia and -entia, which depended on the vowel in the stem word, from PIE *-nt-, adjectival suffix.

Latin present-participle endings for verbs stems in -a- were distinguished from those in -i- and -e-. Hence Modern English protestant, opponent, obedient from Latin protestare, opponere, obedire.

As Old French evolved from Latin, these were leveled to -ance, but later French borrowings from Latin (some of them subsequently passed to English) used the appropriate Latin form of the ending, as did words borrowed by English directly from Latin (diligence,absence).

English thus inherited a confused mass of words from French (crescent/croissant), and further confused it since c. 1500 by restoring -ence selectively in some forms of these words to conform with Latin. Thus dependant, but independence, etc.