The act of immersing, or the state of being immersed; a sinking within a fluid; a dipping; as, the immersion of Achilles in the Styx. [1913 Webster]
Submersion in water for the purpose of Christian baptism, as, practiced by the Baptists. [1913 Webster]
The state of being overhelmed or deeply absorbed; deep engagedness. [1913 Webster]
"Too deep an immersion in the affairs of life." [1913 Webster]
The dissapearance of a celestail body, by passing either behind another, as in the occultation of a star, or into its shadow, as in the eclipse of a satellite; -- opposed to emersion. [1913 Webster]

Immersion lens, a microscopic objective of short focal distance designed to work with a drop of liquid, as oil, between the front lens and the slide, so that this lens is practically immersed.

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OXFORD DICTIONARY

immersion, n.
1 the act or an instance of immersing; the process of being immersed.
2 baptism by immersing the whole person in water.
3 mental absorption.
4 Astron. the disappearance of a celestial body behind another or in its shadow.

Idiom

immersion heater an electric heater designed for direct immersion in a liquid to be heated, esp. as a fixture in a hot-water tank.

Etymology

ME f. LL immersio (as IMMERSE)

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THESAURUS

immersion

absorbed attention, absorption, affusion, application, aspergation, aspersion, baptism, baptismal gown, baptismal regeneration, baptistery, baptizement, bath, bathing, bedewing, burial, chrismal, christening, concentration, contemplation, dampening, damping, deep study, deep thought, deluge, dewing, dip, dipping, dousing, drowning, duck, ducking, dunking, engagement, engrossment, engulfment, flooding, font, hosing, hosing down, humidification, immergence, infusion, intentness, inundation, involvement, irrigation, laving, meditation, moistening, monomania, obsession, preoccupation, profound thought, rapt attention, rinsing, single-mindedness, sinking, souse, sousing, sparging, spattering, splashing, splattering, spraying, sprinkling, studiousness, study, submergence, submersion, swashing, total immersion, watering, wetting

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ROGET THESAURUS

immersion

Insertion

N insertion, implantation, introduction, insinuation, planting injection, inoculation, importation, infusion, forcible ingress, immersion, submersion, submergence, dip, plunge, bath, interment, clyster, enema, glyster, lavage, lavement, inserted.

Water

N water, serum, serosity, lymph, rheum, diluent, agua, aqua, pani, dilution, maceration, lotion, washing, immersion, humectation, infiltration, spargefaction, affusion, irrigation, douche, balneation, bath, deluge, high water, flood tide, watery, aqueous, aquatic, hydrous, lymphatic, balneal, diluent, drenching, diluted, weak, wet, the waters are out.

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