Webster Dictionary (4.00 / 1 vote) Rate this definition: Proficiency (noun) the quality of state of being proficient; advance in the acquisition of any art, science, or knowledge; progression in knowledge; improvement; adeptness; as, to acquire proficiency in music
Additional terms include: 1  retrocessed uterus: both the superior and inferior ends of the uterus are pushed posteriorly.  severely anteflexed uterus: the uterus is in the same position as normal and bends in the same direction (concave is anterior) but the bend is much more pronounced.
There can be medical problems which change the position of the uterus (such as surgery, uterine fibroids, endometeriosis etc), but this is rare. The position of the fundus (top of the uterus) also is characterized: anteflexed means the top of the uterus is forward, retroflexed means the top of the uterus is backwards. In other words, anteflexed means the uterus looks like a C going forward. There is no effect on fertility based on any position.