What is the exact synonym/meaning of the word 'अभिज्ञ' (Abhijna)?

The word 'अभिज्ञ' (Abhijna) means someone who knows, is well-aware, or is knowledgeable about a subject (Janakar). Its antonym is 'अनभिज्ञ' (Anabhijna), which means unaware.