extra-n; 5 Senses

Sense Number 1: a minor actor in a crowd scene

Commentary: EXTRA[+entity][+person][+actor][+minor][+crowd]

John's brother was a Hollywood extra in several action movies.
They are auditioning extras next week for the new Broadway musical.

WordNet 3.0 Sense Numbers: 1

Sense Number 2: additional edition of a newspaper

Commentary: EXTRA[+entity][+artifact][+document][+newspaper][+edition][+additional]

The printing presses are running extras with news covering the election results.
Extra, extra, read all about it! (refers to the extra edition)

WordNet 3.0 Sense Numbers: 2

Sense Number 3: additional charge or cost tacked on to an invoice

Commentary: EXTRA[+quantity][+cost][+money][+charge][+additional]
NOTE: hidden or additional expenses attached to a bill or invoice

WIth the extras of sales tax and service charge, the bill came to over $70.
You need to check for hidden extras in the fine print when figuring out whether this phone service will actually be cheaper than the one you currently have.

WordNet 0.0 Sense Numbers: 1b

Sense Number 4: an additional desirable accessory, a frill

Commentary: EXTRA[+entity][+artifact][+accessory][+desirable][+frill]
NOTE: refers to add_ons beyond the normal, frills, luxuries

The salesman said the new convertible model was loaded with extras, including leather seats.
There are fewer extras nowadays when flying first class, than there used to be.

WordNet 0.0 Sense Numbers: 1d

Sense Number 5: a duplicate of something, serving as a backup

Commentary: EXTRA[+entity][+artifact][+duplicate][+backup]
NOTE: implies the 'extra' is a copy of something else, a duplicate

Mary will have to share John's copy of the proposal because there are no extras.
In case her camera's battery goes flat, Sally always carries an extra in her case. (battery)
While you are fetching a beer, could you bring some extras for the rest of us?

WordNet 3.0 Sense Numbers: 3