noun:

• rising tone (in Chinese)
• (of a Japanese accent) having a high, flat tone

noun:

• agalactia; lactation failure - Medicine term
• flat chest; absence of breasts - slang

noun:

• first tone in old Chinese phonetics; level tone
• (of a Japanese accent) having a low, flat tone

noun / ~する noun:

• dispiritedness; dejection; languor; lethargy; apathy
• becoming flat (e.g. beer, carbonated drinks); becoming stale

expression / ichidan verb:

• to feel exhausted (after having been stressed); to feel spent; to feel relieved (from stress)
• to become stale (i.e. of a carbonated beverage); to go flat; to lose flavor; to lose flavour

noun:

• one face; one surface
• the whole surface
• one aspect; one side

noun / adverbial noun:

• (on) the other hand
• one broad, flat object
• front page (e.g. newspaper)

ichidan verb / transitive:

• to eat up (completely)
• to put down (a rebellion); to suppress; to subjugate
• to make flat; to level out - archaism

noun / ~する noun:

• purchase; buying; buying out

noun / ~する noun / transitive:

• buying used articles as a company; trade-in; buy back

noun / ~する noun:

• purchase on a no-return policy

noun:

• lump-sum payment; flat fee

adverb / ~と adverb:

• clanging; banging; booming; loudly - onomatopoeia

adverb / ~と adverb / ~する noun:

• throbbing (headache); pounding; splitting - onomatopoeia

adverb / ~と adverb:

• fully; vigorously; hard (e.g. working); flat out - onomatopoeia - colloquialism

godan ~つ verb / intransitive verb:

• to stick up (hair, etc.); to stand up straight
• to stand up abruptly; to jump to one's feet
• to stand in one place, doing nothing in particular; to stand around; to stand flat-footed

noun:

• face
• mask; face guard
• (in kendo) striking the head - Martial Arts term
• surface (esp. a geometrical surface)
• page

noun / suffix:

• aspect; facet; side
• chamfer

counter:

• counter for broad, flat objects, levels or stages, e.g. in a video game