From Longman Dictionary of Contemporary Englishobservationob‧ser‧va‧tion /ˌɒbzəˈveɪʃən $ ˌɑːbzər-/ ●●○W3 noun 🔊 🔊 1[countable, uncountable]WATCH the process of watching something or someone carefully for a period of timeobservation of 🔊 Bloomfield’s approach to linguistics was based on observation of the language. 🔊 He spent two nights under close observation in hospital. 🔊 His orders were to keep the men under observation. 🔊 Art classes help develop children’s powers of observation. 🔊 Careful observation suggests that this is not the case. 🔊 Detailed observations were carried out on the behaviour of the students. 🔊 From their direct observations, children absorb a model of marriage.2[countable] something that you notice when watching something or someone 🔊 Some interesting observations emerged from this research.3[countable]SAY a spoken or written remark about something you have noticedobservation on 🔊 Darwin’s observations on the habits of certain birdsobservation about 🔊 Paz makes some observations about the role of the critic.► see thesaurus at comment4[uncountable]OBEY the act of obeying a law etc syn observance —observational adjectiveCOLLOCATIONSphrasesbe under observation (=be in the process of being watched)The police said that the house had been under observation.keep somebody under observation (=closely watch someone or something over a period of time)The doctor ordered that the patient be kept under observation.somebody’s powers of observation (=someone’s abilty to watch things in a way that helps them learn and understand more)In the past, people used their own powers of observation to forecast the weather.ADJECTIVES/NOUN + observationclose/careful/detailed observationA lot of useful knowledge is gained by careful observation of the world around you.casual observation (=observation that is not done in a very careful or organized way)Even casual observation makes this theory improbable.direct observationPiaget developed his theories based on direct observation of children.personal observation (=watching and understanding something yourself, rather than hearing or reading about it)I knew cigarettes were addictive from personal observation.scientific observation (=observation done for scientific purposes)Scientific observation led to the discovery of vaccines.classroom observation (=observation of a teacher and children in a classroom)Classroom observation is only part of what school inspectors do.observation + NOUNan observation post/point (=a place from where you can observe something)The peak of the mountain was a natural location for an observation post.an observation deck/platform/tower (=a structure that is built in order to observe something)The army built an observation tower on the top of the building.phrasesa period of observationThe hospital released him after a period of observation.