Charak Samhita
दोषादीनांतुभावानांसर्वेषामेवहेतुमत्। मानात्सम्यग्विमानानिनिरुक्तानिविभागशः ॥१५७॥
Etymologically vimana is termed because of providing proper and correct knowledge of the specific features of entities like dosha etc. with reasoning and classification.
english translation
doSAdInAMtubhAvAnAMsarveSAmevahetumat। mAnAtsamyagvimAnAniniruktAnivibhAgazaH ॥157॥
hk transliteration by Sanscript