Definition of Opener

Noun: opener ow-pu-nu(r)

The first event in a series
"she played Chopin for her opener"; "the season's opener was a game against the Yankees"
A person who unfastens, unwraps or opens
- undoer, unfastener, untier
A hand tool used for opening sealed containers (bottles or cans)

Adjective: open (opener,openest) ow-pun

Affording unobstructed entrance and exit; not shut or closed
"they left the door open"; "an open door";
- unfastened
Affording free passage or access
"open drains"; "the road is open to traffic"; "open ranks"
With no protection or shield
"open to the weather"; "an open wound";
- exposed
Available to or viewable by the public
"an open protest"; "an open letter to the editor"
Used of mouth or eyes
"keep your eyes open";
- opened
Not having been filled
"the job is still open"
Accessible to all
"open season"; "an open economy"
Not defended or capable of being defended
"an open city"; "open to attack";
- assailable, undefendable, undefended
(of textures) full of small openings or gaps
"an open texture";
- loose
Having no protecting cover or enclosure
"an open boat"; "an open fire"; "open sports cars"
(set theory) of an interval that contains neither of its endpoints
Not brought to a conclusion; subject to further thought
"an open question";
- undecided, undetermined, unresolved
Not sealed or having been unsealed
"the letter was already open";
- opened
Without undue constriction as from e.g. tenseness or inhibition
"the clarity and resonance of an open tone"; "her natural and open response"
Ready or willing to receive favourably
"open to the proposals";
- receptive
Observable; not secret or hidden
"open ballots";
- overt
Not requiring union membership
"an open shop employs nonunion workers"
Possibly accepting or permitting
"open to interpretation"; "an issue open to question";
- capable, subject
Affording free passage or view
"open waters"; "the open countryside";
- clear
Openly straightforward and direct without reserve or secretiveness
"an open and trusting nature";
- candid, heart-to-heart
Ready for business
"the stores are open"