a distinct layer or level within a system, often conceived as having depth or hierarchy
a problem or question that is confusing and needs a lot of skill or effort to solve or answer
a single-celled microorganism that typically reproduces by cell division and can be found in various environments, including soil, water, and living organisms
a device with a long thin bar and a weight at the end that swings side to side to keep a clock working
the wall separating the audience and the stage in a theater hall, including the arch on its top
a concise collection or summary of information, typically presented in a single volume or document
severe criticism or public condemnation, often directed at someone's actions or behavior that is considered shameful or disgraceful
an unpleasant or noxious odor, typically emanating from decaying matter or industrial processes
a period of one thousand years, usually calculated from the year of the birth of Jesus Christ
a temporary suspension or halt of an ongoing activity, often imposed by an authority
a facility offering care for patients with mental or medical conditions needing extended treatment
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