Meanings

every (one) year

from the beginning

first-time customer (of an inn or a restaurant)

one year ago

a day or two

all day long

digital single-lens reflex camera

just one person

at a glance

one Nth part (e.g. one fifth, one tenth)

(in) a day or two

lifetime supply

(wearing only) a pair of underpants

something that will last a lifetime (esp. high quality product)

low-ranking samurai

(a) bunch

one example of (when there are more examples)

as one of

depends entirely on

for one thing ...