navigable

[nav-i-guh-buhl]
adjective
1.
deep and wide enough to provide passage to ships: a navigable channel.
2.
capable of being steered or guided, as a ship, aircraft, or missile.

Origin:
1520–30; < Latin nāvigābilis, equivalent to nāvigā(re) to sail (see navigate) + -bilis -ble

navigability, navigableness, noun
navigably, adverb
nonnavigability, noun
nonnavigable, adjective
nonnavigableness, noun
nonnavigably, adverb
unnavigability, noun
unnavigable, adjective
unnavigableness, noun
unnavigably, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
navigable (ˈnævɪɡəbəl)
 
adj
1.  wide, deep, or safe enough to be sailed on or through: a navigable channel
2.  capable of being steered or controlled: a navigable raft
 
naviga'bility
 
n
 
'navigableness
 
n
 
'navigably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

navigable
1520s, from navigation + -able.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Without an atmosphere to transmit heat or sound, each patch of the moon is an
  island in an unnavigable sea.
Large snowfall totals are uncommon, but the parks do experience snow, which can
  make roads and trails unnavigable.
Signs are incomprehensible, and traffic is often unnavigable.
Early prospectors and explorers declared the whitewater unnavigable, and forged
  an eastward detour around it.
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