noun:

• mysteries of one's master's art
• robes and a bowl (monk's key possessions auctioned off at his funeral); "transmission of the dharma from master to disciple (in Zen)" [figurative] - original meaning - Buddhism term

noun:

• jar; pot; vase
• dice cup
• depression (i.e. the basin of a waterfall)
• target (when aiming an arrow) - archaism
• (figurative) bull's-eye - usually written using kana alone ➜ 思うつぼ
• key point (of a conversation, etc.) - usually written using kana alone
• acupuncture point; moxibustion point - usually written using kana alone
• nodes on a fingerboard (of a shamisen, etc.) - often ツボ - usually written using kana alone

adjective:

• low (rank, degree, value, content, quality, etc.) Antonym: 高い・高い
• low (position); close to the ground
• short (height)
• deep (voice); in a low key; low (volume)

noun or verb acting prenominally:

• calm; composed; cool
• settled; fixed; established
• unobtrusive; quiet; subdued; low-key (color)

noun / ~する noun:

• retreat; falling back; moving backwards; reversing; retrogression; retraction
• recession; waning

noun:

• backspace (key) - IT term

adjectival noun / noun:

• major; large; important; famous Antonym: マイナー

noun:

• Major (oil companies)
• measure; tape measure
• major league - abbreviation - Baseball term ➜ メジャーリーグ
• major (key, scale, etc.) - Music term ➜ 長調【ちょうちょう】