I will allow you to perform an essential task for me, one that many of my followers would give their right hands to perform…
The Invisibility Cloak would, of course, be essential, and as an added precaution, Harry thought he would take the Marauders Map, which, next to the cloak, was the most useful aid to rule-breaking Harry owned.
He had always thought of Fudge as a kindly figure, a little blustering, a little pompous, but essentially good-natured.
"I don’t know where Barty Crouch is," Dumbledore told Moody, "but it is essential that we find him."
The first and most essential step is to remove Azkaban from the control of the dementors —
…he was the able-bodied servant I needed, and, poor wizard though he is, Wormtail was able to follow the instructions I gave him, which would return me to a rudimentary, weak body of my own, a body I would be able to inhabit while awaiting the essential ingredients for true rebirth … a spell or two of my own invention … a little help from my dear Nagini," Voldemorts red eyes fell upon the continually circling snake, "a potion concocted from unicorn blood, and the snake venom Nagini…
There are no more uses of "essential" in the book.
Show samples from other sources
The essential feature of the pen is that it writes so consistently.
I carry all the essential tools and materials I need in this toolbox.