Instrumental

1.

~ in something doing something (serving as a means, helpful, helping to bring about, performed on or written for a musical instrument) នៃពន្ធជំនួយ, ជួយអោយបានសម្រេច, ដែលចេញវិភាគទាន, ដែលនាំអោយ, ដែលជួយអោយ, អោយមាន, ដែលសម្រាប់ប្រើជាឧបករណ៍, ដែលគេលេងដោយប្រើគ្រឿង, be instrumental in ដែលជួយធ្វើអោយកើតមានឡើង, instrumental music ដែលប្រើគ្រឿងភ្លេងធម្មតា
Example: Our artistic director was Instrumental in persuading orchestra to come and play for us.

1.

Acting as an instrument; serving as a means; contributing to promote; conductive; helpful; serviceable; as, he was instrumental in conducting the business.

2.

Pertaining to, made by, or prepared for, an instrument, esp. a musical instrument; as, instrumental music, distinguished from vocal music.

3.

Applied to a case expressing means or agency; as, the instrumental case. This is found in Sanskrit as a separate case, but in Greek it was merged into the dative, and in Latin into the ablative. In Old English it was a separate case, but has disappeared, leaving only a few anomalous forms.

1.

contributory, effective, helpful, useful