noun / ~する noun:

• publication of two or more different books together as one - obscure term

noun:

• type-1 adjective (i.e. one that uses "ku" conjugation) - obscure term - Linguistics term ➜ ク活用

noun:

• type-2 adjective (i.e. one that uses "shiku" conjugation) - obscure term - Linguistics term ➜ シク活用

expression:

• one who knows little often repeats it - proverb

noun:

• the thirty guardian deities (a different one for each day)

noun:

• right wing organization, esp. one using "black van" propaganda trucks

noun:

• drinking establishment where one drinks while standing ➜ 立ち飲み

adjectival noun:

• looking like one is in a good mood

noun:

• unimpeded bodily function (one of the six supernormal Buddhist powers) - Buddhism term ➜ 六神通

noun:

• prisoner (for one to three years under the ritsuryo system) - archaism ➜ 徒【ず】

noun / ~する noun:

• backcrossing (crossing a hybrid with one of its parents)

noun:

• backcross

noun:

• one of those; a you-know - colloquialism ➜ そっち系
• gay; homosexual - slang

noun / ~する noun:

• dying of shame; being so ashamed one wants to die ➜ 慙死

adverb:

• whether one wants to or not; without choice

noun:

• beginning; commencement; outset

~の noun:

• first (one comes to); approaching

noun:

• affability; approachability

noun:

• woman one dates only with the purpose of having sex - slang

noun / ~する noun:

• actually tasting a food that one has heard of before

noun:

• evergreen (esp. one planted or used at a shrine) ➜ 賢木

noun:

• single sexual encounter; one-night stand - From English "one night love"

noun:

• monokini; one piece swimsuit with an exposed back
• bikini briefs

noun:

• cheap SIM card (usu. one provided by an MVNO)

noun:

• path staked out for one (by somebody else) - idiom

noun:

• simultaneously striking one another (in kendo, etc.)
• draw; tie

noun:

• syncretism (interworking of two or more cultural perspectives into one system)

noun:

• rail car (esp. a small one used in mines, etc.); trolley - From English "truck"