Exchange
Part of speech: noun
Definition: An act of exchanging or trading. A place for conducting trading. (telephony, US only?) The fourth through sixth digits of a ten-digit phone number (the first three before the introduction of area codes). A conversation.
Part of speech: verb
Definition: To trade or barter. To replace with a similar item.
Example sentence: There is a saying that if you get something for free, you should know that you're the product. It was never more true than in the case of Facebook and Gmail and YouTube. You get free social-media services, and you get free funny cat videos. In exchange, you give up the most valuable asset you have, which is your personal data.
Rally
Part of speech: noun
Definition: A sequence of strokes between serving and scoring a point.A demonstration.An event in which competitors drive through a series of timed special stages at intervals. The winner is the driver who completes all stages with the shortest cumulative time.A recovery after a decline in prices; -- said of the market, stocks, etc.
Part of speech: verb
Definition: To collect, and reduce to order, as troops dispersed or thrown into confusion; to gather again; to reunite.To come into orderly arrangement; to renew order, or united effort, as troops scattered or put to flight; to assemble; to unite.To collect one's vital powers or forces; to regain health or consciousness; to recuperate.To recover strength after a decline in prices; -- said of the market, stocks, etc.To tease; to chaff good-humouredly.
Example sentence: The American flag is an enduring symbol of liberty, democracy, and justice. It is fitting that the House act to protect it as we approach our nation's birthday, and as our men and women in uniform rally behind it in Iraq's battlefields.