a substance that tastes sour, reacts with metals and carbonates, and turns blue litmus red. e.g. lemon juice a defense provided by the body against disease concerning the way someone acts a person who is selected by others as a contestant for an office or honor concerning living in a colony how much is spent on things; the process of eating and drinking to show the relationship between two items or events. a decision made by an expert based on the results of an examination talk, conversation strongest the length of time that something lasts a negatively charged particle definite, clearly stated the state of being identified; something that identifies a person to cause, to persuade about space a statement that can be proved a quantity that has both size and direction. speed in a given direction a speech sound; a, e , i, o, u and sometimes y