Рассмотрение началось утром.

Рассмотрение is a noun. It literally means something like consideration, examination, or review, depending on context.

It comes from the verb family рассматривать / рассмотреть (to consider, to examine, to review). In official or formal language, Russian often uses nouns like this where English might prefer a verb.

So instead of saying something more verbal like They started considering it in the morning, Russian can say Рассмотрение началось утром — literally The consideration began in the morning.

Because началось agrees with рассмотрение, and рассмотрение is neuter singular.

In the past tense, Russian verbs agree in gender and number with the subject:

• masculine: начался
• feminine: началась
• neuter: началось
• plural: начались

Since рассмотрение ends in -ие, it is a neuter noun, so the verb must be началось.

The dictionary form is начаться.

That verb means to begin, to start, often with the sense to begin by itself or to get underway.

So:

• начаться = to begin, to start
• началось = began / started

This is the past tense, neuter singular form.

The -сь is the short form of the reflexive particle -ся.

So:

• начать = to start something
• начаться = to begin / to start

This is an important Russian distinction:

• Они начали заседание. = They started the session.
• Заседание началось. = The session began.

In your sentence, рассмотрение is the thing that began, so Russian uses the reflexive verb начаться, not начать.

Утром is the instrumental case form of утро (morning).

In Russian, the instrumental case is often used to express time when with parts of the day:

• утром = in the morning
• днём = in the daytime / during the day
• вечером = in the evening
• ночью = at night

So утром here means in the morning.

This is just a normal Russian time expression, and it is very common.

It is definitely natural, but it sounds fairly formal or official.

That is because рассмотрение is a somewhat formal noun. You are likely to see this kind of wording in:

• legal language
• official reports
• meeting records
• news reports
• administrative writing

In everyday conversation, a Russian speaker might choose a more verbal sentence instead, depending on the situation.

It is in the nominative case because it is the subject of the sentence.

You can tell it is the subject because it is the thing that began:

• Что началось? — Рассмотрение.
• What began? — The consideration / review.

So:

• рассмотрение = nominative singular
• началось = past tense verb agreeing with that subject
• утром = instrumental of time

Yes, Russian word order is flexible.

The neutral order here is:

• Рассмотрение началось утром.

But you could also say:

• Утром рассмотрение началось.
• Началось рассмотрение утром.

These versions are grammatically possible, but they may shift the emphasis slightly.

For example:

• Рассмотрение началось утром. = neutral statement
• Утром рассмотрение началось. = emphasis on in the morning
• Началось рассмотрение утром. = more marked, often stylistic or context-driven

For a learner, the original sentence is the safest and most neutral version.

Russian has no articles like English a/an and the.

So рассмотрение can mean:

• consideration
• the consideration
• a review
• the review

The exact meaning depends on context.

In this sentence, English usually needs an article, but Russian does not. Russian speakers rely on context, word order, and the situation instead of articles.

The verb начаться is perfective.

That makes sense because the sentence refers to the beginning as a completed event: at some point, the process started.

Russian often uses the perfective aspect for a single completed event in the past:

• начинаться = imperfective, to be beginning / to begin repeatedly
• начаться = perfective, to begin

So Рассмотрение началось утром presents the start as one completed event: the review began in the morning.

Yes. Рассмотрение is somewhat broad, so the best English translation depends on context.

Possible translations include:

• The review began in the morning.
• The consideration began in the morning.
• The examination began in the morning.
• The hearing began in the morning.

For example:

• in a court setting, it might mean hearing
• in an administrative setting, review or consideration
• in a general analytical setting, examination

So the Russian grammar stays the same, but the best English wording depends on what exactly is being discussed.