Extinction has occurred when an operantly conditioned response no longer occurs. This happens when the reinforcement that was previously maintaining the behavior is no longer provided, leading to a decrease or disappearance of the response over time.

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -PE-A-T--. That is, nine letter words with 2nd letter P and 3rd letter E and 5th letter A and 7th letter T. In alphabetical order, they are:

operantly

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern OP--A-T--. That is, nine letter words with 1st letter O and 2nd letter P and 5th letter A and 7th letter T. In alphabetical order, they are:

operantly

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 9 words with the pattern O--R-N---. That is, nine letter words with 1st letter O and 4th letter R and 6th letter N. In alphabetical order, they are:

operantly

optronics

outrances

outranged

outranges

outranked

outrunner

overinked

overtness

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 10 words with the pattern OP---N---. That is, nine letter words with 1st letter O and 2nd letter P and 6th letter N. In alphabetical order, they are:

operantly

oppugnant

oppugners

oppugning

optionals

optionees

optioning

optronics

opulences

opulently