Merriam-Webster's Collegiate® Dictionary, 11th Edition
PINPOINT
I. noun
Date: 1849
something that is extremely small or insignificant, the point of a pin, an extremely small or sharp point,
II. adjective
Date: 1897
extremely fine or precise, located, fixed, or directed with extreme precision , small as a pinpoint,
III. transitive verb
Date: 1917
to locate or aim with great precision or accuracy ,
2. to fix, determine, or identify with precision , to cause to stand out conspicuously ; highlight