adverb, noun
Used adverbially or as a noun to mean 'on every occasion' or 'without fail'. Often implies a repeated pattern, sometimes with a nuance of 'as usual'.
毎度のことですが、また遅刻ですね。
As always, you're late again.
この店に
I'm always indebted to this shop.
interjection
thank you for your patronage; welcome (in a shop)
Abbreviation of 毎度ありがとうございます. A familiar greeting used by shop staff to regular customers, often when they enter or leave. Casual and business-like.
See also: 毎度ありがとうございます
「毎度！」と店主が声をかけた。
"Thanks for coming!" the shopkeeper called out.
常連客が入ると、店員が「毎度」と言った。
When a regular customer entered, the clerk said, "Welcome back!"
interjection
hello (when visiting a home); I'm coming in
Dialectal (Hokuriku) greeting used when entering someone's home. Not standard Japanese; may be unfamiliar outside the region.
玄関で「毎度」と言って上がるのが、この地方の習慣だ。
It's a custom in this region to say "hello" at the entrance before coming in.