'observation' definitions:

Definition of 'observation'

From: WordNet
noun
The act of making and recording a measurement
noun
The act of observing; taking a patient look [syn: observation, observance, watching]
noun
A remark expressing careful consideration [syn: observation, reflection, reflexion]
noun
Facts learned by observing; "he reported his observations to the mayor"
noun
The act of noticing or paying attention; "he escaped the notice of the police" [syn: notice, observation, observance]

Synonyms of 'observation'

From: Moby Thesaurus