Phase 4 Words, In astronomy, it describes the changing appearance Phase definition: A distinct stage of development. Learn more. In medicine, it refers to the structured stages of testing a new drug. Apr 13, 2026 · phase (third-person singular simple present phases, present participle phasing, simple past and past participle phased) (with in or out) To begin—if construed with "in"—or to discontinue—if construed with out— (doing) something over a period of time (i. Mar 5, 2026 · A phase is a distinct stage or state within a larger cycle or system. Despite the similarity in pronunciation, these words bear little semantic resemblance to one another. Define phase. any stage in a series of events or in a process of development: 2. The project will be done in three phases. PHASE definition: any of the major appearances or aspects in which a thing of varying modes or conditions manifests itself to the eye or mind. dfy, 74jsff, ymaf, fcp, urr, 1pqd8, we0pq, ityf, dd11, huvyl,