all right

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective In proper or satisfactory condition.
• adjective Acceptable; allowable.
• adjective Informal Satisfactory; good.
• adjective Correct.
• adjective Average; mediocre.
• adjective Not in danger or difficulty; safe or uninjured.
• adjective In good physical or mental condition; healthy or untroubled.
• adverb In a satisfactory way; adequately.
• adverb Very well; yes. Used as a reply to a question or to introduce a declaration.
• adverb Without a doubt.
• interjection Used to express great satisfaction, approval, or happiness.

from the GNU version of the Collaborative International Dictionary of English.

• adjective satisfactory; better than average.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective good; in acceptable, if not excellent condition
• adjective In good health, unharmed.
• adverb fairly well
• adverb informal Most certainly; for sure.
• interjection Used to affirm, indicate agreement, or consent.
• interjection Used to indicate support, favor or encouragement.
• interjection Used to fill space or pauses.
• interjection Used as a general lead-in or beginning.
• interjection Used to express exasperation or frustration, often with already.
• interjection UK, informal Used as a greeting, roughly equivalent to how are you

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adverb in a satisfactory or adequate manner
• adjective being satisfactory or in satisfactory condition
• adverb without doubt (used to reinforce an assertion)
• adverb an expression of agreement normally occurring at the beginning of a sentence