一

lack of unity; inconsistency; disharmony

Medicine

gender identity disorder; GID; gender dysphoria

having nothing

Buddhism

being free of earthly attachments

dissociative identity disorder

the best in the land; the best of its kind in the country; par excellence in the whole country

stubborn; obstinate; adamant; immovable

Kansai-ben

first-year (university) student; freshman

(one of the) first graduates of a new school

round-the-world trip; world cruise

without intermission for ten (long) years; with constancy of purpose for ten (long) years; in the same old rut for years on end

someone (important); person of importance

combined junior high and high school

unparalleled in Japan, China and India

Nouns which may take the genitive case particle 'no'

one star (rating)

一つ星 only

evening star; morning star

Abbreviation; Linguistics; Part of speech tag used in dictionaries

conjugation (inflection, declension) of ichidan verbs ending in "iru"

desperate measure; last-ditch effort

reunification

exclusively; (taking) best care

fundamental; primary; most important

in complete harmony

ordinary; common; mediocre

Archaic

first day of the month

first ten days of the lunar month

to be faced with the choice between two alternatives; to be presented with two difficult choices

Abbreviation; Linguistics; Part of speech tag used in dictionaries

conjugation (inflection, declension) of ichidan verbs ending in "eru"

Proverb

if you run after two hares you will catch neither