A person with a high degree of skill in or knowledge of a certain subject, A person with extensive knowledge or ability in a given subject, a person with special knowledge or ability who performs skillfully, adjective_ of or relating to or requiring special knowledge to be understood, having or showing knowledge and skill and aptitude, Characteristic of an expert
The act of breathing out; exhalation, The act of coming to a close; termination, That which is expired; matter breathed forth; that which is produced by breathing out, as a sound
having come to an end or become void after passage of a period of time, that is no longer valid, that has been breathed out, verb_ Simple past tense and past participle of expire
To make plain or comprehensible, To offer reasons for or a cause of; justify, transitive verb_ To make plain, manifest, or intelligible; to clear of obscurity; to expound; to unfold and illustrate the meaning of, to get rid of by explanation, verb_ make plain and comprehensible, define