A person who has served in the armed forces, A person who is long experienced or practiced in an activity or capacity, One who has been long exercised in any service or art, particularly in war; one who has had much experience, or has grown old or decrepit in service, adjective_ Having had long experience, practice, or service, Of or relating to former members of the military armed forces, especially those who served during wartime, rendered competent through trial and experience
to declare or affirm solemnly and formally as true, check or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard, confirm the truth of, transitive To confirm or establish the authenticity of by examination or competent evidence; to authenticate, To attest to the truth of (something) formally or under oath, To make a formal verification in support of (a pleading)