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coalesce

/ˌkoʊəˈles//ˌkəʊəˈles/·verb
to come together and merge into a single whole
Fig. 1 — A dozen separate beads hang scattered, each keeping to its own small roundness.
01Definition

To coalesce is for separate things to merge into one — from the Latin coalescere, 'to grow together'. Droplets coalesce into a single bead; scattered groups coalesce into a movement; loose ideas coalesce into a theory. The word implies more than gathering: the parts lose their separate edges and become a unified body, the way mercury beads snap into one when they touch. It is the quiet opposite of disperse — convergence carried all the way to fusion.

02In use
  • iThe small streams coalesce into a single river before reaching the sea.
  • iiOver the months, their separate complaints began to coalesce into a coalition with one coherent demand.
  • iiiDust and gas slowly coalesce under gravity to form a star.
03Collocations
  • coalesce into
  • coalesce around
  • gradually coalesce
  • coalesce into a whole

Family coalescence (noun) · coalescent (adjective)

04Relations

=merge, fuse, unite, consolidate, converge

≠disperse, fragment, split

05Compared
PairThe difference
coalesce vs amalgamateorganizations deliberately merged into one → amalgamate; separate things growing together into one on their own → coalesce.
coalesce vs blendmix things into one smooth whole by a deliberate action → blend; let separate things grow together into one on their own → coalesce.
coalesce vs coincideseparate things grow together into one whole → coalesce; two independent things share the same point or time → coincide.
coalesce vs combineparts growing together into one whole on their own → coalesce; separate things deliberately brought together into a set → combine.
coalesce vs concentrateseparate things grow together into one whole → coalesce; gather things to a centre to intensify, thicken or focus → concentrate.

Also compared with consolidate, converge, disband, disperse, dissipate, dissolve, diverge, divide, fuse, integrate, intersect, join, meet, merge, scatter, separate, split, unite

06TOEFL & IELTS

TOEFL science passages use 'coalesce' literally — droplets, cells, and dust clouds forming stars — while history and politics passages use it figuratively, as factions 'coalesce around' a leader or idea. In IELTS writing, 'opinions coalesce' elegantly describes forming consensus. Note the noun 'coalescence' and the prepositions: coalesce *into* one thing, or *around* a center.

07Asked
How do you pronounce coalesce?
Koh-uh-LESS (/ˌkoʊəˈles/) — three syllables, stress on the last, and the intimidating -esce ending collapses to a plain /es/ sound. The same trick unlocks its lookalikes: acquiesce, effervesce, convalesce all end in the same quiet 'ess'. Four letters, one quiet syllable.
What is the difference between coalesce and merge?
Merge tolerates a survivor: when companies merge, one name often survives the other. Coalesce is fusion without a winner — the parts give up their edges mutually and become a new single body. In the scene above, each bead sinks into the central drop until you cannot say which part used to be which; that unanswerable question is the word's signature.
What is the difference between coalesce and combine?
Combine is the broad, neutral term, and its parts may stay distinct — combined forces still march under separate flags, combined ingredients can still be tasted apart. Coalesce insists the separateness ends: droplets, factions, or ideas grow together into one continuous thing. All coalescing is combining; very little combining goes as far as coalescing.
What is the difference between coalesce and converge?
Both bring separate things together, but they stop at different places. Converging paths meet at a point and can stay distinct — rivers converge, yet each stream is still traceable for a while below the join. Coalescing goes one step further: the parts fuse and lose their edges, so nothing separate is left. Converge is arrival at a shared point; coalesce is becoming one substance.
What is coalescence in science?
The merging of like bodies into one: cloud droplets coalesce until they are heavy enough to fall as rain, and gravitational-wave astronomers use 'binary coalescence' for the moment two orbiting black holes or neutron stars spiral together into a single object. From raindrops to black holes, the same word spans the scales.
What is the opposite of coalesce?
Disperse — one motion gathers everything into a single body, the other scatters a body into fragments. The two words face each other, scene against scene, on the coalesce vs disperse page in the 'Compared' list above.