7604
Of interest , this theoretical concept is the basis of an operational definition for the length of a metre is " " the distance traveled by light in a vacuum during a time interval of 1 / 299,792,458 of a second " " .
 time: second
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 time: second