W/o
w/o definition by Slang.net - The Slang Dictionary
This page explains what the abbreviation "w/o" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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W/o is short for "without," which is a way to say that something is absent or not included. It is typically seen online, in emails, and in text messages.
The abbreviation is the opposite of "w/," which is the shorthand version of "with." The "o" is simply added to represent the "out" in "without."
Some instances where you may see "w/o" include when talking about how someone won't be joining you, how a person lacks something, or when batteries are not included with the new toy, which seems to always be the case. Other abbreviations that utilize the forward-slash (/) include "b/c," "w/e," "b/f," and "b/w."