be aware of

go through (mental or physical states or experiences)

notice or perceive

observe with care or pay close attention to

see for the first time; make a discovery

an ability to understand the meaning or importance of something (or the knowledge acquired as a result)

perceive by a physical sensation, e.g., coming from the skin or muscles

perceive in terms of a past experience

register (perceptual input)

perceive intuitively or through some inexplicable perceptive powers

perceive what is not there; have illusions