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.
Breakthrough bleeding is a common type of abnormal uterine bleeding. Regular exercise can cause subtle changes in your hormone levels that interfere with the cyclic buildup and shedding of the lining of your uterus. The lining of your uterus may respond to these mixed up signals by randomly shedding which causes the breakthrough bleeding.