a device for showing the operating condition of some system
a signal for attracting attention
(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction
bear (a cost or penalty), in recompense for some action; "You'll pay for this!"; "She had to pay the penalty for speaking out rashly"; "You'll pay for this opinion later"
give money, usually in exchange for goods or services; "I paid four dollars for this sandwich"; "Pay the waitress, please"
discharge or settle; "pay a debt"; "pay an obligation"
do or give something to somebody in return; "Does she pay you for the work you are doing?"
make a compensation for; "a favor that cannot be paid back"
presently existing in fact and not merely potential or possible; "the predicted temperature and the actual temperature were markedly different"; "actual and imagined conditions"
being or existing at the present moment; "the ship's actual position is 22 miles due south of Key West"
taking place in reality; not pretended or imitated; "we saw the actual wedding on television"; "filmed the actual beating"
existing in act or fact; "rocks and trees...the actual world"; "actual heroism"; "the actual things that produced the emotion you experienced"
being or reflecting the essential or genuine character of something; "her actual motive"; "a literal solitude like a desert"- G.K.Chesterton; "a genuine dilemma"