Something extremely small or trifling.
A very small or sharp point: a pinpoint of light.
A point on a map marking a precise location or target.
To locate or identify with precision.
To take precise aim at: pinpoint a target.
To direct attention to: We pinpointed the flaws in his argument.
Meticulously precise: measured the line with pinpoint accuracy.
Extremely small; minuscule: pinpoint creatures.
[pin-point] 
(pĭn'point') 