simple past tense and past participle of observe
"The scientist observed that the plant grew taller when placed in direct sunlight."
In plain English: To observe means to watch something carefully with your eyes or other senses.
"She observed that the cat was hiding under the porch."
Usage: Use observed to describe something that was seen or noticed in the past, such as noticing a change in behavior. It also serves as the past participle in passive constructions, like stating that rules were observed by everyone.
discovered or determined by scientific observation
"variation in the ascertained flux depends on a number of factors"
"the discovered behavior norms"
"discovered differences in achievement"
"no explanation for the observed phenomena"
Derived from the Latin observare, meaning to watch closely or notice, this past participle originally described the act of paying attention to something. It later evolved in English to denote compliance with rules or scientific measurement based on careful observation.