I heard some people talk about the spirit of the world, what do they mean?

The fifth dimension.

IT could mean a number of things eg we are in the world but should not be of the world to seek fame and fortune and all it has to offer or the spirit of ANTICHRIT to follow evil doers who rejects GOD or the spirit of GOD that restrain evil such as unseen spirits.

The earth vibrates at a certain frequency. 7.83 Hertz. When we are in alignment with it, it brings us peace of mind and boosts health. Nikola Tesla taught us so much about vibrations and frequencies.

The spirit of the world refers to the attitudes and ways of doing things of some people. They do things without caring what God says in His Word the Bible because they don’t have the spirit of God.

It think they mean the pervasive hedonistic attitude of society.

The ungodly beliefs and activities the world presents to us, and tries to draw us into.

The phrase the spirit of the world is a term the apostle Paul used in 1 Corinthians 2:12, where he contrasts the spirit of the world with the Spirit of God: “What we have received is not the spirit of the world, but the Spirit who is from God, so that we may understand what God has freely given us.”

As opposed to the spirit of the world, the Holy Spirit imparts true wisdom to the believer. The Holy Spirit enables us to receive and understand “the secret and hidden wisdom of God” (1 Corinthians 2:7). Only God’s Spirit can reveal spiritual truth because only His Spirit knows “the deep things of God” (verse 10).

The spirit of the world can be understood in one of three ways. In one interpretation, the spirit of the world is a demonic spirit or perhaps Satan in particular. Elsewhere in Scripture, Satan is called “the ruler of this world” (John 12:31; 14:30; 16:11) and “the god of this world” (2 Corinthians 4:4). He is “the spirit who is now at work in those who are disobedient” (Ephesians 2:2).

Others suggest that Paul wasn’t referring to an evil spirit, per se, but rather a mindset that is foreign to and opposed to the Spirit of God—it’s humanity’s sinful disposition, which could be called a spirit of rebellion, covetousness, pride, and falsehood. A third view is that the spirit of the world is human wisdom in general or the basic human process of understanding, as expressed in secular philosophy and worldly wisdom.

God makes worldly wisdom, as promoted by the spirit of the world, foolish: “Where is the wise person? Where is the teacher of the law? Where is the philosopher of this age? Has not God made foolish the wisdom of the world? For since in the wisdom of God the world through its wisdom did not know him, God was pleased through the foolishness of what was preached to save those who believe” (1 Corinthians 1:20–21). From a worldly, human standpoint, it is foolish to believe in Jesus Christ as the way of salvation.

The spirit of the world leads to foolishness because human wisdom is independent of God’s true wisdom. Human wisdom tends to boast before God; it is proud. Human wisdom rejects the person and work of Christ, who is “the power of God and the wisdom of God” (1 Corinthians 1:24). True wisdom from the Spirit of God whom we have received recognizes that our salvation is entirely unmerited and wholly by God’s grace: “God chose the foolish things of the world to shame the wise; God chose the weak things of the world to shame the strong. God chose the lowly things of this world and the despised things—and the things that are not—to nullify the things that are, so that no one may boast before him. It is because of him that you are in Christ Jesus, who has become for us wisdom from God—that is, our righteousness, holiness and redemption. Therefore, as it is written: ‘Let the one who boasts boast in the Lord’” (verses 27–31).

Although the Corinthian believers claimed to be spiritually mature, they were, in fact, showing their immaturity through pride and division. Paul taught them that, to be truly mature, they would have to abandon human wisdom (the spirit of the world) for the Holy Spirit’s pure wisdom of the gospel. Believers cannot perceive the wonderful, hidden treasures they have received from God by looking with their natural, human eyes.

It's detailed in the Bible in Ephesians 2:2. "You were made alive, you who were dead in trespasses and sins, where in times past you walked according to the ways of this world and of the ruler of the kingdom of the air, the spirit who is now at work in those who are disobedient." It goes on to describe that worldly, demonic spirit as gratifying the cravings of our sinful nature, following its desires and thoughts.

This means that the spirit of the world controls people's thoughts and desires, enticing them to think sinful thoughts and to indulge their sinful lusts. Those who used to live by that invisible power but who repented and put their trust in Christ were delivered from such deadness and made alive in Christ. Only then could they see how controlled they had been, ruled by that demonic spirit of the world.

Definition: The impelling force that influences human society made up of those who are not servants of Jehovah God, causing such people to say and do things according to a characteristic pattern. Although people act on individual preferences, those who manifest the spirit of the world give evidence of certain basic attitudes, ways of doing things, and aims in life that are common to the present system of things of which Satan is ruler and god.

some of the characteristics of the spirit of the world against which we need to be on guard?1 Cor. 2:12: “Now we received, not the spirit of the world, but the spirit which is from God, that we might know the things that have been kindly given us by God.” (If the spirit of the world takes root in a person’s thinking and desires, its fruitage is soon seen in actions that manifest that spirit. So, breaking free from the spirit of the world requires not only avoiding unchristian activities and excesses but also getting to the root of the matter by cultivating attitudes that reflect God’s spirit and genuine love for his ways. This you should keep in mind as you consider the following manifestations of the spirit of the world.)

The spirit of the world invokes differential phase distributions that allow for incremental reversals of transient conditions which are necessary for stable filters to process the nanoparticles.