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nature, outdoors, wild, wilderness—more at NATURE

open–air adjective : of or relating to the outdoors : OUTDOOR <~ theaters>

open arms noun plural : an eager or warm welcome

open·hand·ed adjective : liberal in giving : GENEROUS

— open·hand·ed·ly adverb

Synonyms

bountiful, charitable, free, generous, liberal, munificent, unselfish, unsparing—more at GENEROUS

open–heart adjective : of, relating to, or performed on a heart temporarily relieved of circulatory function and laid open for repair of defects or damage

open–hearth adjective : of, relating to, or being a process of making steel in a furnace that reflects the heat from the roof onto the material

open·ing noun 1 : an act or instance of making or becoming open

2 : BEGINNING

3 : something that is open

4 : a favorable opportunity or circumstance : OCCASION; also : an opportunity for employment

Synonyms

[3] breach, break, discontinuity, gap, gulf, hole, interval, rent, rift, separation—more at GAP

[4] chance, occasion, opportunity, room—more at OPPORTUNITY

open mike noun : an event in which amateurs may perform

open–mind·ed adjective : free from rigidly fixed preconceptions

— open–mind·ed·ness noun

Synonyms

broad-minded, liberal, nonorthodox, nontraditional, progressive, radical, unconventional, unorthodox—more at LIBERAL

broad-minded, open, receptive; also impartial, neutral, objective, unbiased, unprejudiced; easygoing, tolerant; calm, detached, dispassionate; detached, dispassionate; amenable, compliant; impressionable, suggestible, susceptible

Antonyms

narrow-minded

open·ness noun : the quality or state of being open

Synonyms

candor, directness, forthrightness, frankness, plainness—more at CANDOR

open sentence noun : a statement (as in mathematics) containing at least one blank or unknown so that when the blank is filled or a quantity substituted for the unknown the statement becomes a complete statement that is either true or false

open shop noun : an establishment having members and nonmembers of a labor union on the payroll

open·work noun : work so made as to show openings through its substance

— open–worked adjective

1opera plural of OPUS

2opera noun : a drama set to music

— op·er·at·ic adjective

op·er·a·ble adjective 1 : fit, possible, or desirable to use

2 : likely to result in a favorable outcome upon surgical treatment

Synonyms

available, fit, functional, practicable, serviceable, usable, useful—more at USABLE

opera glasses noun plural : small binoculars for use in a theater

op·er·ate verb -at·ed; -at·ing 1 : to perform work : FUNCTION

2 : to produce an effect

3 : to put or keep in operation; also : to manage the operation of

4 : to perform or subject to an operation

— op·er·a·tor noun

Synonyms

[1, 2] act, function, perform, take, work—more at ACT

[3] command, control, direct, drive, guide, handle, maneuver, pilot, run, steer, use, wield, work

[3] administer, carry on, conduct, govern, guide, handle, manage, oversee, regulate, run, superintend, supervise—more at CONDUCT

operating system noun : software that controls the operation of a computer

op·er·a·tion noun 1 : a doing or performing of practical work

2 a : an exertion of power or influence

b : method or manner of functioning

3 : a surgical procedure

4 a : a process of deriving one mathematical expression from others according to a rule

b : a function or correlation when conceived as a process of proceeding from one or more entities to another according to a definite rule

5 : a usu. military action or mission

6 : a usu. small business

Synonyms

[2a] administration, conduct, control, direction, government, guidance, management, oversight, regulation, running, superintendence, supervision—more at CONDUCT

[2b] course, procedure, proceeding, process—more at PROCESS

[2b] application, employment, exercise, play, use—more at USE

op·er·a·tion·al adjective : of or relating to operation or an operation

Synonyms

active, alive, functional,