This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Existing, living, or going without others; alone: a solitary traveler. See Synonyms at alone.

adj. Happening, done, or made alone: a solitary evening; solitary pursuits such as reading and sewing.

adj. Remote from civilization; secluded: a solitary retreat.

adj. Having no companions; lonesome or lonely.

adj. Zoology Living alone or in pairs only: solitary wasps; solitary sparrows.

adj. Single and set apart from others: a solitary instance of cowardice.

n. A person who lives alone; a recluse.

n. Solitary confinement.

n. One who lives alone, or in solitude; an anchoret, hermit or recluse.

adj. Living or being by one's self; alone; having no companion present; being without associates.

adj. Performed, passed, or endured alone; as, a solitary journey; a solitary life.

adj. Not much visited or frequented; remote from society; retired; as, a solitary residence or place.

adj. Not inhabited or occupied; without signs of inhabitants or occupation; desolate; deserted; silent; still; hence, gloomy; dismal; as, the solitary desert.

adj. Single; individual; sole.

adj. Not associated with others of the same kind.

adj. Living or being by one's self; having no companion present; being without associates; single; alone; lonely.

adj. Performed, passed, or endured alone.

adj. Not much visited or frequented; remote from society; retired; lonely.

adj. Not inhabited or occupied; without signs of inhabitants or occupation; desolate; deserted; silent; still; hence, gloomy; dismal.

adj. Single; individual; sole.

adj. Not associated with others of the same kind.

n. One who lives alone, or in solitude; an anchoret; a hermit; a recluse.

Living alone, or by one's self or by itself; without companions or associates; habitually inclined to avoid company.

All by one's self; without companions; unattended.

Marked by solitude; especially, remote from society; unfrequented; retired; secluded; lonely: as, a solitary glen.

Free from the sounds of human life; still; dismal.

Having a sense of loneliness; lonesome.

Retiring; diffident.

Passed without company; shared by no companions; lonely.

Single; sole; only, or only one: as, a solitary instance; a solitary example.

In botany, one only in a place; separate: as, a solitary stipule.

In anatomy, single; separate; not clustered; not agminate or gathered into patches; simple; not compound: as, the solitary follicles of the intestine.

In zoöl.:

Not social, sociable, or gregarious: noting species living habitually alone, or in pairs only.

Simple; not compound, aggregate, or colonial: as, solitary ascidians. See Simplices.

n. One who lives alone or in solitude; an anchorite; a recluse; a hermit.

In astronomy, noting certain stars which have no conspicuous neighbors (a Hydræ, for instance), or stars which are not members of a binary system, visual or spectroscopic. Called by W. Herschel intersystematical.

adj. being the only one; single and isolated from others

adj. of plants and animals; not growing or living in groups or colonies

adj. lacking companions or companionship

n. one who lives in solitude

n. confinement of a prisoner in isolation from other prisoners

adj. devoid of creatures

adj. characterized by or preferring solitude

"It is more difficult to say which extreme is worst, among _an equal number of individuals_; but probably the city; for in the country, vice is oftener solitary, and less frequently social; while in the city it is not only _social_ but also _solitary_."

single    ungregarious    unaccompanied    uninhabited    unsocial   

confinement   

solitary sandpiper    solitary bees    vireo    solitary ants    solitary wasps    solitary glands    solitary follicle    solitary bundle    solitary funiculus    solitary vireo   

solitariness    solitary confinement    solitary tinamou   

single    alone    lonely    retired    desolate    deserted    silent    still    dismal    individual   

lonely    silent    lone    single    occasional    miserable