Nouns ending in -ment are masculine.
The suffix often marks an action or result derived from a verb.
Is enseignement masculine or feminine?
l'enseignement
The rule behind it
99.6% of -ment nouns are masculine
In context
Cette entreprise imprime beaucoup d'ouvrages d'enseignement.
This firm prints a lot of educational books.
Il propose la réforme de l'enseignement universitaire.
He advocates reform of university education.
L'enseignement est la meilleure forme d'apprentissage.
Teaching is the best form of learning.