Meaning can be fixed. Your approch is completely subjective. If we see things objectively than meaning is same for all people regarless of their culture, education, experience etc. For exaple three persons in a room talking about weather, one from hot areas would say it very cold today, one from cold regions would say it is very hot today but if we say that today temperature is 35 degrees than all will agree on it. Sceince always tries to be objective. Moon revolves around earth, 2+2=4, Newtons laws are same everywhere, water boils at 100 degree C. Few of the philosopher like Bertrand Russel and Wittengstien tried to make language objective. According to them all the problems in the world arise out of the subjective intepretaion of the events. They bthought if the language is made objective like language of mathematics than number of problems will be resolved. Both of the philosopher failed in their project but their is always a possibility that meaning can be fixed.