in and out movement (esp. during intercourse); pistoning
extraction; abstraction; selection (from a group); sampling
lottery; raffle; drawing (of lots); balloting
lottery (event); raffle; draw
abstractness; abstraction
abstract concept; abstraction; abstract idea
sampling (e.g. for a survey); extraction method
abstract painting; abstract art
selling by lottery (esp. due to excessive demand)
abstract expressionism (art movement)
abstract human labour; abstract human labor
abstract algebra; modern algebra
self-extracting (computer file)
named entity recognition; named entity extraction; named entity identification; NER
extractor mark (on a cartridge)
abstract testing methodology
message-submission abstract-operation
Summarize abstract-operation