差

letter rack

indiscriminate mass murder

staggered work hours

Mathematics

common difference

tolerance (in engineering, manufacturing, etc.); allowance; allowable error

difference between the finishing times of two competitors in a race (expressed in lengths in horse racing); winning margin

mean deviation

Mathematics

arithmetic progression; arithmetic sequence

provisional seizure; provisional attachment; provisional garnishment

slight difference; narrow margin

phase-contrast microscope

Physics

(optical) aberration

age discrimination; agism

Medicine

non-allergic (vasomotor) rhinitis brought about by a sudden change in temperature

chromatic aberration

burakumin (modern-day descendants of Japan's feudal outcast group)

gender gap; male-female divide

annual variation

Colloquial

marriage in which one partner (esp. the wife) has a significantly higher income or social status

pay gap; wage gap; wage differential

racism

difference between track followed by front and back inner wheels when turning

pointing and calling (occupational safety method)

deviation-value-oriented education; education focused on test results; education that stresses studying and passing exams to raise one's ranking; academic cramming

Anatomy

optic chiasm; optic chiasma