οταν conjunction
hotan  hot'-an: whenever (implying hypothesis or more or less uncertainty); also causatively (conjunctionally) inasmuch as -- as long (soon) as, that, + till, when(-soever), while.
εν preposition
en  en: in, at, (up-)on, by, etc.
τω definite article - dative singular masculine
ho  ho: the definite article; the (sometimes to be supplied, at others omitted, in English idiom) -- the, this, that, one, he, she, it, etc.
κοσμω noun - dative singular masculine
kosmos  kos'-mos: orderly arrangement, i.e. decoration; by implication, the world (in a wide or narrow sense, including its inhabitants, literally or figuratively (morally) -- adorning, world.
ω verb - present subjunctive - first person singular
o  o: e ay; etc. be -- + appear, are, (may, might, should) be, have, is, + pass the flower of her age, should stand, were.
φως noun - nominative singular neuter
phos  foce: luminousness (in the widest application, natural or artificial, abstract or concrete, literal or figurative) -- fire, light.
ειμι verb - present indicative - first person singular
eimi  i-mee': a prolonged form of a primary and defective verb; I exist (used only when emphatic) -- am, have been, it is I, was.
του definite article - genitive singular masculine
ho  ho: the definite article; the (sometimes to be supplied, at others omitted, in English idiom) -- the, this, that, one, he, she, it, etc.
κοσμου noun - genitive singular masculine
kosmos  kos'-mos: orderly arrangement, i.e. decoration; by implication, the world (in a wide or narrow sense, including its inhabitants, literally or figuratively (morally) -- adorning, world.