(ordinal number, before the noun) second / (in names of monarchs and popes, after the name) the second

(fractional number) second (unit of time)

according to, as per, per

the main course of a meal, often consisting of meat or fish, following the primo piatto and before any dessert

Second Reich

leap second

in my opinion (according to my opinion)

a person who is always a bridesmaid, never a bride / second best

background (part of the picture behind the subject) / (typically preceded by in or di) position of relative unimportance; accessoriness; back burner

ulterior motive