fixity

1.the fixity of his stare.

他光的专注。

2.a stiff collar); with reference to persons it often suggests a lack of ease, cold formality, or fixity, as of purpose:

硬领)； 指人时常指缺乏轻松的、僵硬的礼节的固定：

3.When transformation of parts of speech takes place, we should distinguish synchronism from diachronism, grammar from rhetoric anti fixity from temporariness.

摘要转类，应当区分历时和共时、语法和修辞学、固定的和临时性的。