capable of or susceptible to being wounded or hurt, as by a weapon: a vulnerable part of the body.
open to moral attack, criticism, temptation, etc.: an argument vulnerable to refutation; He is vulnerable to bribery.
(of a place) open to assault; difficult to defend: a vulnerable bridge.
Bridge. having won one of the games of a rubber.

1595–1605; < Late Latin vulnerābilis, equivalent to Latin vulnerā(re) to wound + -bilis -ble; see vulnerary

vulnerability, vulnerableness, noun
vulnerably, adverb
unvulnerable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vulnerable (ˈvʌlnərəbəl)
1.  capable of being physically or emotionally wounded or hurt
2.  open to temptation, persuasion, censure, etc
3.  liable or exposed to disease, disaster, etc
4.  military liable or exposed to attack
5.  bridge (of a side who have won one game towards rubber) subject to increased bonuses or penalties
[C17: from Late Latin vulnerābilis, from Latin vulnerāre to wound, from vulnus a wound]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1605, from L.L. vulnerabilis "wounding," from L. vulnerare "to wound," from vulnus (gen. vulneris) "wound," perhaps related to vellere "pluck, to tear."
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

vulnerability definition

A bug or feature of a system that exposes it to possible attack, a flaw in the system's security.
A common example of a vulnerability due to a bug is buffer overrun, where carefully constructed input can allow an attacker to insert arbitrary code into a running program and have it executed.
The most serious vulnerabilities are those in network software, especially if they exploit traffic that is allowed through the firewall like HTTP, for example exploiting a bug in a web browser.
The Open Source Vulnerability Database lists many vulnerabilities.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Overall vulnerability to hurricanes has grown from multiple causes.
And the data highlighted some other points of vulnerability.
If patients do not adhere perfectly to their drug regimen, the virus rapidly
  eliminates its vulnerability.
It will be a primordial reminder of our time and place, and of our power and
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