Why is it der Opponent?

Opponent ends in -ent, and most nouns ending in -ent are masculine: in a German dictionary, 84% of them take der.

All nouns ending in -ent
Sense 1
der

Meaning

[1] Person who represents a different opinion

[1] Person, die eine andere Meinung vertritt

Examples

[1] "He calculated with his opponents by issuing the notorious prosripations, with which unpopular opponents could be eliminated"

[1] „Er rechnete mit seinen Gegnern ab, indem er die berüchtigten Proskriptionen erließ, womit missliebige Opponenten kurzerhand eliminiert werden konnten.“

Declension

1 Singular Plural
Nominativ der Opponent die Opponenten
Genitiv des Opponenten der Opponenten
Dativ dem Opponenten den Opponenten
Akkusativ den Opponenten die Opponenten

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary