<p><strong>Noun</strong></p><ul><li>an indication or piece of evidence: The smoke curling from the chimney was a sign that someone was in the cabin.</li><li>any object, action, event, pattern, etc., that is taken as conveying a meaning: I took her silence and fidgeting as a sign of disagreement.</li><li>a conventional or arbitrary mark, figure, or symbol used as an abbreviation for the word or words it represents: The dollar sign ($) can be found on your keyboard above the numeral 4.</li><li>a motion or gesture used to express or convey an idea, command, decision, etc.: Her nod was a sign that it was time to leave.</li><li>a notice, bearing a name, direction, warning, or advertisement, that is displayed or posted for public view: a traffic sign; a store sign.</li><li>a trace; vestige: I looked in my car for your glasses, but there was no sign of them.</li><li>an omen; portent: The general unrest was a sign of the approaching revolution.</li><li>sign of the zodiac.</li><li>sign language.</li><li>usually signs.</li><li>traces, such as footprints or scat, of a wild animal.</li><li>a plus sign or minus sign used as a symbol for indicating addition or subtraction.</li><li>a symbol, such as √ or !, used to indicate a radical or factorial operation.</li></ul><p><strong>Verb</strong></p><ul><li>to affix a signature to: to sign a letter.</li><li>to write as a signature: to sign one's name.</li><li>to engage or hire by a written agreement: to sign a new player.</li><li>to mark with a sign, especially the sign of the cross.</li><li>to communicate by means of a sign; signal: He signed his wish to leave by an impatient wave of his hand.</li><li>to convey (a message) in a sign language.</li><li>to indicate one's acceptance of a contract by a signature: He signed with another team for the next season.</li><li>to indicate one's approval: The president is expected to sign off on the new agreement.</li><li>to end a conversation, especially on the phone or online: It's been good talking to you—I'm going to sign off and get back to work.</li><li>to log in to an account on a device or website by entering one’s identifying information: Go to the Members page and sign in with your username and password.</li><li>to commit oneself to a job or other activity by signing a contract: He signed on as a pitcher with a major-league team.</li></ul>