under/in normal circumstances

:  in or into a position below or beneath something

:  below or short of some quantity, level, or limit

:  in or into a condition of subjection, subordination, or unconsciousness

:  below or beneath so as to be overhung, surmounted, covered, protected, or concealed by

:  subject to the authority, control, guidance, or instruction of

:  receiving or undergoing the action or effect of

:  lower in rank or authority :  subordinate

:  perpendicular

:  perpendicular to a tangent (see ¹tangent 3) at a point of tangency

:  according with, constituting, or not deviating from a norm, rule, or principle

:  a normal line

:  the portion of a normal line to a plane curve between the curve and the x-axis

:  one that is normal

:  a condition, fact, or event accompanying, conditioning, or determining another :  an essential or inevitable concomitant

:  a subordinate or accessory (see ²accessory 2) fact or detail

:  a piece of evidence that indicates the probability or improbability of an event (such as a crime)