W: (adj) observable [Related to: observe] (capable of being seen or noticed) "a discernible change in attitude"; "a clearly evident erasure in the manuscript"; "an observable change in behavior"
W: (v) observe (follow with the eyes or the mind) "Keep an eye on the baby, please!"; "The world is watching Sarajevo"; "She followed the men with the binoculars"
W: (v) observe (observe with care or pay close attention to) "Take note of this chemical reaction"
W: (v) observe (watch attentively) "Please observe the reaction of these two chemicals"
W: (v) observe (stick to correctly or closely) "The pianist kept time with the metronome"; "keep count"; "I cannot keep track of all my employees"