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AN indicates the rank of airman or E-3 in the field of aviation. not to be confused with the us airforce's use of the term airman to describe all of their personnell
First base is a term used in baseball but it is also widely used as a metaphor to disguise what happened on a date. In the past it wasn't acceptable to discuss sexual matter openly so American boys began using this term as a type of code.
In forex trades, it refers to the first currency in a currency pair which has the same meaning as the term "base currnecy".
3C is a reenlistment code that is used when the person in question is not eligible to reenlist in the Air Force, but may reenlist in another service with an appropriate waiver.
two men on base, runners in scoring position second and first, second and third and especially on the corners third and first base
Sexist - or if it's about sexual preference: lesbian.
The common definition of the term "choose from" are to select freely and after consideration or to decide on especially by vote or to have a preference for.
This is an outdated term refering to sexual orientation (whether a person is straight, bi, or gay). The term originated before it was fully understood that a person's sexual orientation is not a choice or "preference" but rather, an unchangeable nature.
Fundus is the medical term meaning base.