Proficient (adjective)

1. Having or showing a high degree of skill or competence in a particular activity or field.
2. Adequate for the purpose; satisfactory.
3. Having or showing a high degree of knowledge or understanding of a particular subject.

Origin:

The word proficient comes from the latin word proficere, meaning "to make progress" and it has been in use since the 16th century.

Examples:

1. She is proficient in Spanish.
2. He is proficient in playing the piano.
3. The team is proficient in their field of work.
4. The student's proficiency in math is impressive.
5. The company's proficient management led to its success.