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Definitions of lead:

noun:   the playing of a card to start a trick in bridge
Example: "The lead was in the dummy"

noun:   a position of leadership (especially in the phrase `take the lead')
Example: "He takes the lead in any group"

noun:   mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil
noun:   thin strip of metal used to separate lines of type in printing
noun:   an advantage held by a competitor in a race
Example: "He took the lead at the last turn"

noun:   evidence pointing to a possible solution
Example: "The police are following a promising lead"

noun:   the introductory section of a story
Example: "It was an amusing lead-in to a very serious matter"

noun:   a news story of major importance
noun:   (baseball) the position taken by a base runner preparing to advance to the next base
Example: "He took a long lead off first"

noun:   the angle between the direction a gun is aimed and the position of a moving target (correcting for the flight time of the missile)
noun:   a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull gray
Example: "The children were playing with lead soldiers"

noun:   the timing of ignition relative to the position of the piston in an internal-combustion engine
noun:   an indication of potential opportunity
Example: "A good lead for a job"

noun:   a jumper that consists of a short piece of wire
Example: "It was a tangle of jumper cables and clip leads"

noun:   restraint consisting of a rope (or light chain) used to restrain an animal
noun:   an actor who plays a principal role
verb:   tend to or result in
Example: "This remark lead to further arguments among the guests"

verb:   be ahead of others; be the first
verb:   pass or spend
Example: "Lead a good life"

verb:   cause to undertake a certain action
verb:   travel in front of; go in advance of others
verb:   take somebody somewhere
Example: "We lead him to our chief"

verb:   be in charge of
verb:   be conducive to
Example: "The use of computers in the classroom lead to better writing"

verb:   lead, extend, or afford access
verb:   cause something to pass or lead somewhere
verb:   lead, as in the performance of a composition
verb:   move ahead (of others) in time or space
verb:   result in
verb:   preside over
verb:   stretch out over a distance, space, time, or scope; run or extend between two points or beyond a certain point

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Alternative Terms
guide lode conduct direct escort pilot route shepherd show steer usher carry extend go reach run stretch captain command precede-follow live pass pursue be-similar-words introduce precede preface start-end words-similar-words approach begin commence embark enter inaugurate initiate institute launch open start undertake bring cause effect generate induce ingenerate make occasion secure stir trigger leader clue scent guidance management affect-ineffectiveness principal protagonist star performing-arts-similar-words feature dog-s-life lead-a-double-life lead-by-the-nose lead-down-the-garden-path leading-lights leading-question lead-off lead-on lead-pipe-cinch lead-up-to lead-with-one-s-chin all-roads-lead-to-rome blind-leading-the-blind get-the-lead-out put-lead-in-one-s-pencil you-can-lead-a-horse-to-water-but-you-can-t-make-it-drink feeding electronics electrical-network multimeter through-hole-technology electronic-component phase-physics-in-encyclopedia pencil-lead 1-3-mm-lead take-the-lead sealed-lead-acid-battery fugleman conation retinitis-pigmentosa-prognosis carbohydrate-intolerance-prognosis arterial-plaque-2 plumbic triplumbic-tetroxide lead-poisoning lead-alloys corroding-lead