Taxonomy of meanings for 輕重:  

  • IMPORTANT
    • VP[adN]pluralthe unimportant and the important
    • NPab[post-N]relativethe relative importance of things
  • WEIGHT
    • NPab{nab1ant.nab2}conceptweight
    • NPab{nab1ant.nab2}relativerelative weight
    • NPab{nab1ant.nab2}figurativerelative seriousness (of an offence)