| astronomical | (adjective) relating or belonging to the science of astronomy | Synonyms: astronomic |
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| (adjective) inconceivably large | Synonyms: astronomic, galactic |
| astrophysical | (adjective) of or concerned with astrophysics | - |
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| astute | (adjective) marked by practical hardheaded intelligence | Synonyms: sharp, shrewd |
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| astylar | (adjective) lacking columns or pillars | - |
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| asunder | (adjective) widely separated especially in space | - |
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| asymmetric | (adjective) characterized by asymmetry in the spatial arrangement or placement of parts or components | Synonyms: asymmetrical |
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| asymmetrical | (adjective) characterized by asymmetry in the spatial arrangement or placement of parts or components | Synonyms: asymmetric |
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| (adjective) irregular in shape or outline | Synonyms: crooked |
| asymptomatic | (adjective) having no symptoms of illness or disease | Synonyms: symptomless |
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| asymptotic | (adjective) relating to or of the nature of an asymptote | - |
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| asynchronous | (adjective) not synchronous; not occurring or existing at the same time or having the same period or phase | - |
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| (adjective) (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself | - |
| asyndetic | (adjective) lacking conjunctions | - |
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| asynergic | (adjective) of or relating to the state of asynergy; lacking synergy | - |
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