Pinpoint

['pɪnpɒɪnt] or ['pɪnpɔɪnt]

(noun.) the sharp point of a pin.

(noun.) a very brief moment; 'they were strangers sharing a pinpoint of time together'.

(verb.) locate exactly; 'can you pinpoint the position of the enemy?'; 'The chemists could not nail the identity of the chromosome'.

爱丽丝录入--From WordNet