The decision by the National Education Council represents a shift over how Chile brands the 1973-1990 era that saw Pinochet brutally crack down on anything that smacked of leftist dissent, leaving more than 3,200 people dead and arresting some 38,000.
"In this case, since time has passed, let's get straight to the point and use the word 'dictatorship,'" council president Ignacio Irarrazaval told Radio Bio Bio.
"I understand that using the word military 'dictatorship' may get some opposition but after quite an overhaul in political science, that's the word in use, that's all."
In 2012, the council had approved using both the words "regime" and "dictatorship" interchangeably to describe the Pinochet government in textbooks for children aged six to 12.
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That decision followed a controversial government proposal by right-wing President Sebastian Pinera to use the word "regime," saying it was "more general."
Education Minister Carolina Schmidt asked for "clarification" from the council, and suggested the government would abide by last year's recommendation for now.
"What we want to know is if they want us to use the two phrases in each paragraph or if they only want use to use military dictatorship, in which case we should be told why, because the academics and the same council said the two words were indistinguishable," Schmidt told Radio Cooperativa.
In Chile, his supporters and detractors refer to the Pinochet era differently.
Opponents speak of the Pinochet "dictatorship," while supporters talk about the "military regime" and "military coup.