https://github.com/javirosa/opendatakit/issues/1009
を見ていて「deprecate」？「depreciate」？という疑問で調べてみた。

Deprecated is normally used today for some feature of a computer language which is still supported, but no longer recommended.

There's no substantive difference in meaning between deprecated and obsolete.

Depreciated, on the other hand, derives from Latin pretium=price. It's used of things which have reduced in value over time.

deprecateを使っている例

何かのライブラリでDepreciatedがよく使われていたように思うが、忘れた。