opener

[oh-puh-ner]
noun
1.
a person or thing that opens.
2.
a device for opening sealed containers: can opener.
3.
the first of several theatrical numbers, variety acts, sports events, etc.: a humorous monologue as an opener.
4.
openers, Poker. cards in a hand, as a pair of jacks or better, that according to a given standard are worth enough to enable the holder to make the first bet of a deal.
Idioms
5.
for openers, as an initially stated reason or argument; at the outset; to begin with: Well, for openers, I don't have the money.

Origin:
1540–50; open + -er1

self-opener, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
opener (ˈəʊpənə)
 
n
1.  an instrument used to open sealed containers such as tins or bottles: a bottle opener
2.  a person who opens, esp the player who makes the first bid or play
3.  the first or opening section or episode in a series
4.  (US) the first song, act, etc, in a variety show
5.  (plural) a start; beginning (esp in the phrase for openers)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The real eye-opener is a long-term series including older teenagers.
The offending first draft was something of an eye-opener.
Also the concept of using postpositions rather than prepositions was an
  eye-opener.
It was an eye-opener, with virtuoso dis-plays of color at every turn.
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