<synset id="n05051088" type="n">
<lex_filenum>07<lex_filenum/>
<word lex_id="0">spark advance<word/>
<word lex_id="1">lead<word/>
<pointer refs="n05046009">Hypernym<pointer/>
<def>the timing of ignition relative to the position of the piston in an internal-combustion engine<def/>
<synset/>