WordReference Random House Learner's Dictionary of American English © 2017
del•ta /ˈdɛltə/USA pronunciation
n.[countable], pl. -tas. WordReference Random House Unabridged Dictionary of American English © 2017
- Linguisticsthe fourth letter of the Greek alphabet (&Dgr;
- anything triangular, like the Greek capital delta (&Dgr;
- Place Namesa flat, triangular area of land with rich soil lying between branches of the mouth of a river.
(del′tə),USA pronunciation n.
- the fourth letter of the Greek alphabet (Δ, δ).
- the consonant sound represented by this letter.
- the fourth in a series of items.
- anything triangular, like the Greek capital delta (Δ).
- [Math.]an incremental change in a variable, as Δ or δ.
- a nearly flat plain of alluvial deposit between diverging branches of the mouth of a river, often, though not necessarily, triangular:the Nile delta.
- (usually cap.) a word used in communications to represent the letter D.
- (cap.) [Astron.]a star that is usually the fourth brightest of a constellation:The fourth brightest star in the Southern Cross is Delta Crucis.
(del′tə),USA pronunciation n. [Mil.]
- Greek délta; akin to Hebrew dāleth
- Latin delta
- Middle English deltha 1350–1400
- Militarythe NATO name for a class of Soviet nuclear-powered ballistic missile submarine armed with 16 multi-warhead missiles.
Collins Concise English Dictionary © HarperCollins Publishers::
delta /ˈdɛltə/ n
Etymology: 16th Century: via Latin from Greek, of Semitic origin; compare Hebrew dālethdeltaic /dɛlˈteɪɪk/, ˈdeltic adj
- the fourth letter in the Greek alphabet (Δ, δ), a consonant transliterated as d
- (capital when part of name) the flat alluvial area at the mouth of some rivers where the mainstream splits up into several distributaries
- a finite increment in a variable
'delta' also found in these entries: