- : proficiency
- n.: have sth. at one's fingertips, specialist, great skill, knowledge, expert at, be (well) versed in, saturate oneself (in), be (dead) nuts on [about, round], make oneself master of, at home With sth., at home on sth., at home in sth., be great in, be great at, be adept at, conversance, conversancy, mastery, proficient, know one's way about, be accomplished in, be adept in, be conversant with
- v.: master, know
- adj.: versed, useful, conversant, well-versed, experienced, accomplished
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