previous

As an adverb ahead

is in or to the front; in advance; onward.

As an adjective previous is

prior; occurring before something else, either in time or order.

As a noun previous is

an existing criminal record; short for "previous convictions".

As adjectives the difference between conventional and previous

is that conventional is pertaining to a convention, as in following generally accepted principles, methods and behaviour while previous is prior; occurring before something else, either in time or order.

As nouns the difference between conventional and previous

is that conventional is (finance) a conventional gilt-edged security, a kind of bond paying the holder a fixed cash payment (or coupon) every six months until maturity, at which point the holder receives the final payment and the return of the principal while previous is (informal|uk) an existing criminal record; short for "previous convictions".

As an adjective previous

is prior; occurring before something else, either in time or order.

As a noun previous

is (informal|uk) an existing criminal record; short for "previous convictions".

As a verb proceed is

to move, pass, or go forward or onward; to advance; to continue or renew motion begun.

As adjectives the difference between penultimate and previous

is that penultimate is next to last, second to last; immediately preceding the end of a sequence, list, etc while previous is prior; occurring before something else, either in time or order.

As nouns the difference between penultimate and previous

is that penultimate is a penult, a next-to-last thing, particularly while previous is an existing criminal record; short for "previous convictions".

As nouns the difference between previous and form

is that previous is (informal|uk) an existing criminal record; short for "previous convictions" while form is shape.

As an adjective previous

is prior; occurring before something else, either in time or order.

As adjectives the difference between preliminary and previous

is that preliminary is in preparation for the main matter; initial, introductory, preparatory while previous is prior; occurring before something else, either in time or order.

As nouns the difference between preliminary and previous

is that preliminary is a preparation for a main matter; an introduction while previous is an existing criminal record; short for "previous convictions".

As a verb previse

is to foresee.

As an adjective previous is

prior; occurring before something else, either in time or order.

As a noun previous is

(informal|uk) an existing criminal record; short for "previous convictions".

As nouns the difference between advance and previous

is that advance is a forward move; improvement or progression while previous is (informal|uk) an existing criminal record; short for "previous convictions".

As adjectives the difference between advance and previous

is that advance is completed before need or a milestone event while previous is prior; occurring before something else, either in time or order.

As a verb advance

is to bring forward; to move towards the front; to make to go on.

Anterior is a related term of previous.

As adjectives the difference between anterior and previous

is that anterior is before in place while previous is prior; occurring before something else, either in time or order.

As a noun previous is

(informal|uk) an existing criminal record; short for "previous convictions".

As adjectives the difference between first and previous

is that first is preceding all others of a series or kind; the ordinal of one; earliest while previous is prior; occurring before something else, either in time or order.

As nouns the difference between first and previous

is that first is the person or thing in the first position while previous is an existing criminal record; short for "previous convictions".

As an adverb first

is before anything else; firstly.