at one's fingertips

fingertip

[fing-ger-tip]
noun
1.
the tip or end of a finger.
2.
a covering used to protect the end joint of a finger.
adjective
3.
extending to the fingertips, as a coat, veil, etc.: a fingertip jacket.
Idioms
4.
at one's fingertips,
a.
close at hand; easily or immediately available.
b.
at one's command or disposal, as recall of factual information: He has the answer at his fingertips.
5.
to one's fingertips, thoroughly; perfectly: She was a politician to her fingertips.

Origin:
1835–45; finger + tip1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fingertip (ˈfɪŋɡəˌtɪp)
 
n
1.  the end joint or tip of a finger
2.  another term for fingerstall
3.  at one's fingertips readily available and within one's mental grasp

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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American Heritage
Medical Dictionary

fingertip fin·ger·tip (fĭng'gər-tĭp')
n.
The extreme end or tip of a finger.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Idioms & Phrases

at one's fingertips

Ready at hand, immediately available. This idiom is used both literally, as in This new dashboard design keeps all the important controls at the driver's fingertips, and figuratively, as in Tom was so familiar with the proposal that he had all the details at his fingertips. [Second half of 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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