The performance of being a rational actor according to the narrowly defined standards of a specific field. It involves adopting the vocabulary, metrics, and goals of the field as one's own, and making decisions that are "rational" within that closed system, even if they are irrational or destructive from a wider human perspective.
Field Rationality Example: A student choosing to memorize factoids for a standardized test instead of deeply understanding the subject. This is field rationality: within the field of "educational testing," maximizing your score is the only rational goal. The richer, more meaningful—but less testable—learning is rationally abandoned.
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)