| actable | (adjective) capable of being acted; suitable for the stage | - |
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| actinal | (adjective) (of radiate organisms) located on the surface or end on which the mouth is situated | - |
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| acting | (adjective) serving temporarily especially as a substitute | - |
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| actinic | (adjective) relating to or exhibiting actinism | - |
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| actinoid | (adjective) having a radial form | - |
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| actinometric | (adjective) of or related to actinometry | Synonyms: actinometrical |
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| actinometrical | (adjective) of or related to actinometry | Synonyms: actinometric |
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| actinomorphic | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphous |
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| actinomorphous | (adjective) capable of division into symmetrical halves by any longitudinal plane passing through the axis | Synonyms: actinomorphic |
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| actinomycetal | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetous |
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| actinomycetous | (adjective) of or belonging to the actinomycetes | Synonyms: actinomycetal |
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| actinomycotic | (adjective) of or related to actinomycosis infection | - |
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| actionable | (adjective) affording grounds for legal action | - |
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| activated | (adjective) rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive | - |
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| (adjective) (military) set up and placed on active assignment | - |
| (adjective) (of e.g. a molecule) made reactive or more reactive | Synonyms: excited |
| (adjective) (of sewage) treated with aeration and bacteria to aid decomposition | - |
| activating | (adjective) causing motion or action or change | Synonyms: actuating |
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| active | (adjective) (used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being | Synonyms: dynamic |
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| (adjective) characterized by energetic activity | - |
| (adjective) tending to become more severe or wider in scope | - |
| (adjective) disposed to take action or effectuate change | - |
| (adjective) (of e.g. volcanoes) erupting or liable to erupt | - |
| (adjective) (of e.g. volcanoes) capable of erupting | - |
| (adjective) full of activity or engaged in continuous activity | - |
| (adjective) exerting influence or producing a change or effect | - |
| (adjective) engaged in full-time work | - |
| (adjective) expressing that the subject of the sentence has the semantic function of actor: | - |
| (adjective) (of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions | - |
| (adjective) in operation | Synonyms: alive |
| (adjective) taking part in an activity | Synonyms: participating |
| (adjective) engaged in or ready for military or naval operations | Synonyms: combat-ready, fighting |
| activist | (adjective) advocating or engaged in activism | Synonyms: activistic |
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| activistic | (adjective) advocating or engaged in activism | Synonyms: activist |
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| actual | (adjective) presently existing in fact and not merely potential or possible | Synonyms: existent |
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| (adjective) being or existing at the present moment | - |
| (adjective) taking place in reality; not pretended or imitated | - |
| (adjective) being or reflecting the essential or genuine character of something | Synonyms: genuine, literal, real |
| (adjective) existing in act or fact | Synonyms: factual |
| actuarial | (adjective) of or relating to the work of an actuary | - |
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| actuated | (adjective) moved to action | - |
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| actuating | (adjective) causing motion or action or change | Synonyms: activating |
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