'normally-kept' is a compound word formed from 'normally' and 'kept'. 'Normally' originates from the Latin word 'normalis', meaning 'conforming to a standard'. 'Kept' is the past participle of 'keep', which comes from the Old English 'cēpan', meaning 'to seize or hold'.

'Normally' evolved from the Latin 'normalis' through Old French 'normal', while 'kept' evolved from Old English 'cēpan'. The combination of these words into 'normally-kept' is a modern English construct.

The meaning of 'normally-kept' has remained consistent, referring to something maintained in a usual manner.