Given the task definition and input, reply with output. In this task, you are given a word, followed by two sentences. Your task is to figure out whether both the sentences use the aforementioned word with the same meaning. You should respond with 'True' if the words in both sentences share the same meaning, and 'False' otherwise.

flux 
 Sentence1: It is important to use flux when soldering or oxides on the metal will prevent a good bond. 
 Sentence2: His opinions are in flux.

True.