Select the word that is most opposite in meaning to the word "conceal".

The correct answer is Disclose.

Step-by-step Explanation:
To determine the word that is most opposite in meaning (antonym) to "conceal", let us break down the definition of the given word and evaluate each option.

1. Understanding the Word "Conceal":
The verb conceal means to keep something hidden from sight, secret, or unknown (e.g., "to conceal a secret" or "to conceal an object").

2. Analyzing the Options:
• Withhold: Means to hold back or refuse to give something. This is related in concept to keeping something back, so it is not an opposite.
• Obscure: Means to keep from being seen or to make unclear/hidden. This is a synonym of "conceal".
• Disguise: Means to give a different appearance in order to conceal the true identity of something. This is also a synonym/related term.
• Disclose: Means to make secret or new information known, to uncover, or to reveal. This is the direct opposite in meaning to keeping something hidden or secret.

Conclusion:
Since "conceal" means to hide and "disclose" means to reveal, Disclose is the most opposite word in meaning.