[suh-mair-uh-lee, suhm-er-uh-]
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  1. in a prompt or direct manner; immediately; straightaway.
  2. without notice; precipitately: to be dismissed summarily from one's job.

Origin of summarily

First recorded in 1520–30; summary + -ly Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for summarily

1520s, from summary + -ly (2).

Online Etymology Dictionary, © 2010 Douglas Harper