noun
speculation; financial speculation
Used in financial contexts for speculative trading or investment, similar to English 'speculation'.
彼は株のスペキュレーションで大きな利益を得た。
He made a large profit through stock speculation.
noun
ace of spades (in two-ten jack)
Specific card game term; refers to the ace of spades in the game 'two-ten jack' (ツーテンジャック).
See also: ツーテンジャック
ツーテンジャックでは、スペキュレーションは切り札の一つだ。
In two-ten jack, the ace of spades is one of the trump cards.