(mathematics) arithmetic sequence, arithmetic progression

(mathematics) common difference / (statistics, engineering) tolerance; allowance

(mathematics) equal difference (between numbers)

(mathematics) a sequence of numbers, especially one that shows or is created under a certain pattern

(adverbial particle, dismissive, derogatory) emphasizes disgust, contempt, or otherwise negative feelings of the speaker: whatever

What? What did you say?

whatchamacallit, X

what

What?, Huh?

what / that thing (used in place of words you can't remember at the moment.)