It means, small or little. it may also refer to Greek, or Roman mythology.

Mythology is about Greek mythology.

Thor is a renowned character in Scandinavia mythology.

One gram is equal to one gram.

M. A. Dwight has written:

'Grecian and Roman mythology for schools' -- subject(s): Classical Mythology

'Grecian and Roman mythology' -- subject(s): Greek Mythology, Roman Mythology

'Grecian and Roman mythology' -- subject(s): Classical Mythology, Greek Mythology, Roman Mythology