fertilise in WordNet English dictionary

1. introduce semen into (a female)
   inseminate  fecundate  fertilize  fertilise 
   
2. make fertile or productive
   "The course fertilized her imagination"
   fertilize  fecundate  fertilise 
   
3. provide with fertilizers or add nutrients to
   "We should fertilize soil if we want to grow healthy plants"
   fertilize  fertilise  feed 
   

fertilise in English Wiktionary