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English word -tainment comes from English entertain
entertain (English)
(obsolete) Entertainment; pleasure.. (obsolete) Reception of a guest; welcome. (obsolete) To lead on; to bring along; to introduce.. (obsolete) To meet or encounter, as an enemy.. (obsolete) To take or keep in one's service; to maintain; to support; to harbour; to keep.. (transitive) To amuse (someone); to engage the attention of agreeably.. (transitive) To receive and take into [...]
entertainment (English)
(obsolete) Admission into service; service.. (obsolete) Maintenance or support.. (obsolete) Payment of soldiers or servants; wages.. (obsolete) Reception; (provision of) food to guests or travellers.. A show put on for the enjoyment or amusement of others.. An activity designed to give pleasure, enjoyment, diversion, amusement, or relaxation to an audience, no matter whether the audience [...]
-tainment (English)
Denoting material created in part to entertain, while also serving another purpose.