Consistency; coherence — the state of following the same policy, attitude, or principle from beginning to end (often used as 一貫して).
会社の方針は設立以来一貫している。
The company's policy has been consistent since its founding.
彼は環境問題に対して一貫した立場を取っている。
He has taken a consistent stance on environmental issues.
教育方針が一貫していれば、子どもも安心して学べる。
If the educational policy is consistent, children can study with peace of mind.
彼女の言動には一貫性がなく、信頼を失った。
Her words and actions lacked consistency, and she lost trust.
One kan — an old Japanese unit of weight equal to approximately 3.75 kilograms.
江戸時代の米俵は一貫（約3.75kg）ではなく、一俵何貫という数え方だった。
In the Edo period, rice bales weren't measured as one kan (about 3.75 kg) each, but rather by how many kan made a bale.
One piece (of sushi) — used to count a single serving of sushi (as in 寿司一貫).
寿司を一貫ください。
Please give me one piece of sushi.