After having a chest x-ray what does this mean, small rounded area of increased opacification is noted at the left base, which could either due to ove?

Nonspecific: Pneumonia, fibrosis, atelectasis, pleural lipoma, eventration, etc. Tumor would be less common at your age. Consider followup exam in a month. Don't know what ove refers to.

Several things: Rounded opacification sounds like nodule. Nodules can be related to infection such as fungus or TB. Nodules can represent neoplasm such as primary lung disease or metastasis from primary tumor elsewhere. Benign lesions with treatment usually decrease in size. Malignant lesions usually increase in size with time. Sometimes lesions have to be biopsied to differentiate benign from malignant tumor.

It seems like: your question got cut off just when it would have added some specificity. Rounded opacification could be a mass or infiltrate(pneumonia). Speak with your doc about the results.