veteran
A person with long, important experience, especially in the military.
A veteran is someone who has served in the military, particularly someone who has completed their service or fought in a war. When you hear about veterans on Veterans Day, people are honoring those who served in the Army, Navy, Air Force, Marines, or Coast Guard, often risking their lives to protect their country.
The word carries deep respect. A veteran of World War II might be in their nineties now, but people still thank them for their service decades later. A veteran of more recent conflicts in Iraq or Afghanistan might be younger, still adjusting to civilian life after years in uniform.
The word also means someone with long experience in any field. A veteran teacher has taught for many years and knows how to handle tricky classroom situations. A veteran baseball player has played many seasons and understands the game deeply. In this sense, veteran suggests not just experience but wisdom earned through that experience.
You'll notice people treat the military meaning with special seriousness. Communities hold parades for veterans, offer them special services, and mark their graves with flags. This recognition reflects gratitude for their willingness to serve, often in dangerous circumstances far from home.