The wind strummed soothingly against the cylindrical panes of his windows, and he relaxed exultantly only until they picked up speed again and then turned McWatt left and plunged him right back down, noticing with a transitory spasm of elation the mushrooming clusters of flak leaping open high above him and back over his shoulder to the right, exactly where he could have been if he had not turned left and dived.
There are no more uses of "transitory" in the book.
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Do not be concerned about mild, transitory symptoms.
The goal of this emergency organization is to keep a transitory problem from turning into one that is permanent.