Meaning

• To belittle or express disapproval of.

  "He deprecates any praise of his own merits."

• To declare something obsolescent; to recommend against a function, technique, command, etc. that still works but has been replaced.

  "It is still supported but strongly deprecated."

• To pray against.

• To regret deeply.

Meaning

• Strongly disapproved of.

• Belittled; insulted.

• Said of a function or feature planned to be phased out, but still available for use.

  "Foo() has been deprecated; it outputs a debug message and then calls Foo2()"