1. That which has existed or continued for a long time; of old standing; aged.
2. Firmly established by long continuance; long-established; deep-rooted; obstinate.
3. A reference to a disease: of long standing, chronic; hence, deep-seated and resisting treatment.
4. Persistent, lasting.
5. Full of obstinate prejudice or hatred; embittered, malignant; virulent.
6. Settled or confirmed in habit, condition, or practice; habitual, hardened, obstinate.
7. Someone who is confirmed in some (evil) habit; a confirmed or hardened offender.
8. To make old; to establish or confirm by age or long continuance; to root or implant deeply; to render chronic.

1. One who has had long experience in military service; an old soldier; any ex-serviceman (primarily North American).
2. The meaning of any former member of the armed forces, ex-serviceman (not necessarily old) is first recorded in 1798, in American English, but is alluded to earlier in reference to the same condition in the Roman army
3. One who has seen long service in any office or position; an experienced or aged person.

A reference to a doctor who treats animals. From 1646, formed in English (perhaps by influence of French veterinaire) from Latin veterinarius, "of or having to do with beasts of burden".

The state or condition of being a veteran.

A female veteran.

Growing old.

1. Of long standing; inveterate.
2. Having the authority of age or antiquity.

Someone who is skilled in, or professionally occupied with, the medical and surgical treatment of cattle and domestic animals; a veterinary surgeon.

1. Of or pertaining to, connected or concerned with, the medical or surgical treatment of cattle and domestic animals.
2. From Latin veterinarius, "pertaining to beasts of burden or draft animals"; as in plowing or pulling, especially veterina, "a draft animal", from vetus, "old"; originally "one year old". Veterina bestia probably means "an animal one year old"; hence, strong enough to draw burdens (1729-1797).